Syntax error: EOF in backquote substitution

**description**:
trying to build an executable targetting mac os.

**command**:
```
RUST_BACKTRACE=full MACOSX_DEPLOYMENT_TARGET=10.9 pyoxidizer build
```

**config file**:
```
def make_dist():
return PythonDistribution(local_path="/home/sarpedon/pyoxidizer/starter-zero/cpython-3.8.6-x86_64-apple-darwin-pgo-20201020T0626.tar.zst",sha256="e06807ed4d68928634b2690a86ea7a13d339c0fff3808816e98c646bbdc1f79a")
def make_exe(dist):
policy = dist.make_python_packaging_policy()
python_config = dist.make_python_interpreter_config()
python_config.run_module = "payload3"
exe = dist.to_python_executable(
name="starter-zero",
packaging_policy=policy,
config=python_config,
)
exe.add_python_resources(exe.read_package_root(
path=CWD,
packages=["payload3"],
))
return exe

def make_embedded_resources(exe):
return exe.to_embedded_resources()

def make_install(exe):
files = FileManifest()
files.add_python_resource(".", exe)
return files
register_target("dist", make_dist)
register_target("exe", make_exe, depends=["dist"])
register_target("resources", make_embedded_resources, depends=["exe"], default_build_script=True)
register_target("install", make_install, depends=["exe"], default=True)
resolve_targets()

PYOXIDIZER_VERSION = "0.10.1"
PYOXIDIZER_COMMIT = "cbab9171248d12a9668331fbdc52465e66bc6aee"
```

**full backtrace output**:
```
resolving 1 targets
resolving target install
resolving target exe
resolving target dist
resolving Python distribution Local { local_path: "/home/sarpedon/pyoxidizer/starter-zero/cpython-3.8.6-x86_64-apple-darwin-pgo-20201020T0626.tar.zst", sha256: "e06807ed4d68928634b2690a86ea7a13d339c0fff3808816e98c646bbdc1f79a" }
copying /home/sarpedon/pyoxidizer/starter-zero/cpython-3.8.6-x86_64-apple-darwin-pgo-20201020T0626.tar.zst
Python distribution available at /home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/cpython-3.8.6-x86_64-apple-darwin-pgo-20201020T0626.tar.zst
reading data from Python distribution...
resolving Python distribution Url { url: "https://github.com/indygreg/python-build-standalone/releases/download/20201020/cpython-3.8.6-x86_64-unknown-linux-gnu-pgo-20201020T0627.tar.zst", sha256: "789f58ece3ab4ee599e9fd7f6bd9665157ba1a57dca210739df0687ce3757b55" }
downloading https://github.com/indygreg/python-build-standalone/releases/download/20201020/cpython-3.8.6-x86_64-unknown-linux-gnu-pgo-20201020T0627.tar.zst
Python distribution available at /home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/cpython-3.8.6-x86_64-unknown-linux-gnu-pgo-20201020T0627.tar.zst
reading data from Python distribution...
adding Python executable starter-zero to .
Created binary (application) package
writing /tmp/pyoxidizer.bLb59GulOc4n/starter-zero/.cargo/config
writing /tmp/pyoxidizer.bLb59GulOc4n/starter-zero/build.rs
writing /tmp/pyoxidizer.bLb59GulOc4n/starter-zero/src/main.rs
writing /tmp/pyoxidizer.bLb59GulOc4n/starter-zero/pyoxidizer.bzl
writing /tmp/pyoxidizer.bLb59GulOc4n/starter-zero/starter-zero.exe.manifest
writing /tmp/pyoxidizer.bLb59GulOc4n/starter-zero/starter-zero-manifest.rc
warning: asyncio.__main__ contains __file__
warning: cProfile contains __file__
warning: distutils.command.bdist_wininst contains __file__
warning: distutils.command.sdist contains __file__
warning: distutils.core contains __file__
warning: distutils.dist contains __file__
warning: doctest contains __file__
warning: encodings contains __file__
warning: idlelib.browser contains __file__
warning: idlelib.config contains __file__
warning: idlelib.help contains __file__
warning: idlelib.help_about contains __file__
warning: idlelib.idle contains __file__
warning: idlelib.pyshell contains __file__
warning: idlelib.runscript contains __file__
warning: idlelib.tree contains __file__
warning: importlib contains __file__
warning: importlib._bootstrap contains __file__
warning: importlib._bootstrap_external contains __file__
warning: importlib.abc contains __file__
warning: inspect contains __file__
warning: lib2to3.pygram contains __file__
warning: logging contains __file__
warning: logging.handlers contains __file__
warning: modulefinder contains __file__
warning: multiprocessing.spawn contains __file__
warning: pdb contains __file__
warning: pip.__main__ contains __file__
warning: pip._internal.build_env contains __file__
warning: pip._internal.commands.debug contains __file__
warning: pip._internal.pyproject contains __file__
warning: pip._internal.req.req_install contains __file__
warning: pip._internal.utils.misc contains __file__
warning: pip._internal.utils.setuptools_build contains __file__
warning: pip._internal.utils.virtualenv contains __file__
warning: pip._vendor contains __file__
warning: pip._vendor.certifi.core contains __file__
warning: pip._vendor.distlib.resources contains __file__
warning: pip._vendor.pep517._in_process contains __file__
warning: pip._vendor.pep517.wrappers contains __file__
warning: pip._vendor.pkg_resources contains __file__
warning: pkgutil contains __file__
warning: profile contains __file__
warning: pyclbr contains __file__
warning: pydoc contains __file__
warning: pydoc_data.topics contains __file__
warning: runpy contains __file__
warning: site contains __file__
warning: trace contains __file__
warning: turtle contains __file__
warning: turtledemo.__main__ contains __file__
warning: unittest contains __file__
warning: unittest.loader contains __file__
warning: venv contains __file__
warning: zipimport contains __file__
__file__ was encountered in some embedded modules
PyOxidizer does not set __file__ and this may create problems at run-time
See https://github.com/indygreg/PyOxidizer/issues/69 for more
generating custom link library containing Python...
deriving custom config.c from 93 extension modules
compiling custom config.c to object file
running: "cc" "-O0" "-ffunction-sections" "-fdata-sections" "-fPIC" "-m64" "-I" "/tmp/libpython.ss5sSW5QDjA8" "-Wall" "-Wextra" "-std=c99" "-DNDEBUG" "-DPy_BUILD_CORE" "-o" "/tmp/pyoxidizer-build-exe.uyJ5A0zyVWJv/config.o" "-c" "/tmp/libpython.ss5sSW5QDjA8/config.c"
exit code: 0
running: "ar" "crs" "/tmp/pyoxidizer-build-exe.uyJ5A0zyVWJv/libpyembeddedconfig.a" "/tmp/pyoxidizer-build-exe.uyJ5A0zyVWJv/config.o"
exit code: 0
resolving inputs for custom Python library...
compiling libpythonXY...
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"/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/xmlparse.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/xmlrole.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/xmltok.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/readline.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/resource.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/selectmodule.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/syslogmodule.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/termios.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/timemodule.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/unicodedata.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/xxsubtype.o" "/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/build/Modules/zlibmodule.o"
exit code: 0
libpythonXY created
building with Rust 1.47.0
Updating crates.io index
Compiling libc v0.2.80
Compiling memchr v2.3.4
Compiling lazy_static v1.4.0
Compiling regex-syntax v0.6.21
Compiling fs_extra v1.2.0
Compiling byteorder v1.3.4
Compiling cc v1.0.62
Compiling getrandom v0.1.15
Compiling cfg-if v0.1.10
Compiling proc-macro-hack v0.5.19
Compiling encoding_rs v0.8.26
Compiling anyhow v1.0.34
Compiling autocfg v1.0.1
Compiling cfg-if v1.0.0
Compiling ppv-lite86 v0.2.10
Compiling pyembed v0.10.0 (/home/sarpedon/.cargo/git/checkouts/pyoxidizer-04b02466db45c615/cbab917/pyembed)
Compiling base64 v0.12.3
Compiling same-file v1.0.6
Compiling either v1.6.1
Compiling remove_dir_all v0.5.3
Compiling cpython v0.5.1
Compiling quoted_printable v0.4.2
Compiling embed-resource v1.3.4
Compiling thread_local v1.0.1
Compiling num-traits v0.2.14
Compiling jemalloc-sys v0.3.2
Compiling walkdir v2.3.1
Compiling itertools v0.9.0
Compiling starter-zero v0.1.0 (/tmp/pyoxidizer.bLb59GulOc4n/starter-zero)
Compiling aho-corasick v0.7.15
Compiling rand v0.4.6
Compiling memmap v0.7.0
Compiling base64 v0.10.1
Compiling python-packed-resources v0.4.0
Compiling paste-impl v0.1.18
Compiling rand_core v0.5.1
Compiling regex v1.4.2
Compiling tempdir v0.3.7
Compiling charset v0.1.2
Compiling paste v0.1.18
Compiling rand_chacha v0.2.2
Compiling mailparse v0.13.0
Compiling rand v0.7.3
Compiling python-packaging v0.3.0
Compiling uuid v0.8.1
Compiling python3-sys v0.5.1
error: failed to run custom build command for `python3-sys v0.5.1`

Caused by:
process didn't exit successfully: `/tmp/pyoxidizer.bLb59GulOc4n/build/target/debug/build/python3-sys-effc08422445f104/build-script-build` (exit code: 101)
--- stderr
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: "python script failed with stderr:\n\n/home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/install/bin/python3.8: 6: /home/sarpedon/pyoxidizer/starter-zero/./build/python_distributions/python.e06807ed4d68/python/install/bin/python3.8: Syntax error: EOF in backquote substitution\n"', /home/sarpedon/.cargo/registry/src/github.com-1ecc6299db9ec823/python3-sys-0.5.1/build.rs:450:65
stack backtrace:
0: 0x55f363b269e0 - std::backtrace_rs::backtrace::libunwind::trace::h577ea05e9ca4629a
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/../../backtrace/src/backtrace/libunwind.rs:96
1: 0x55f363b269e0 - std::backtrace_rs::backtrace::trace_unsynchronized::h50b9b72b84c7dd56
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/../../backtrace/src/backtrace/mod.rs:66
2: 0x55f363b269e0 - std::sys_common::backtrace::_print_fmt::h6541cf9823837fac
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:79
3: 0x55f363b269e0 - ::fmt::hf64fbff071026df5
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:58
4: 0x55f363b44a2c - core::fmt::write::h9ddafa4860d8adff
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/fmt/mod.rs:1082
5: 0x55f363b243b7 - std::io::Write::write_fmt::h1d2ee292d2b65481
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/io/mod.rs:1514
6: 0x55f363b28ae0 - std::sys_common::backtrace::_print::ha25f9ff5080d886d
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:61
7: 0x55f363b28ae0 - std::sys_common::backtrace::print::h213e8aa8dc5405c0
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:48
8: 0x55f363b28ae0 - std::panicking::default_hook::{{closure}}::h6482fae49ef9d963
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:200
9: 0x55f363b2882c - std::panicking::default_hook::he30ad7589e0970f9
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:219
10: 0x55f363b29143 - std::panicking::rust_panic_with_hook::haa1ed36ada4ffb03
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:569
11: 0x55f363b28d19 - std::panicking::begin_panic_handler::{{closure}}::h7001af1bb21aeaeb
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:476
12: 0x55f363b26e6c - std::sys_common::backtrace::__rust_end_short_backtrace::h39910f557f5f2367
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:153
13: 0x55f363b28cd9 - rust_begin_unwind
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:475
14: 0x55f363b43d51 - core::panicking::panic_fmt::h4e2659771ebc78eb
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/panicking.rs:85
15: 0x55f363b43b73 - core::option::expect_none_failed::h448b58a024c2c33a
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/option.rs:1221
16: 0x55f363935310 - core::result::Result::unwrap::h8c219f3007b424f0
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/result.rs:973
17: 0x55f36391f860 - build_script_build::main::hb480baf1686495e1
at /home/sarpedon/.cargo/registry/src/github.com-1ecc6299db9ec823/python3-sys-0.5.1/build.rs:450
18: 0x55f36393320b - core::ops::function::FnOnce::call_once::h8bf4f23188e2e9b6
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/ops/function.rs:227
19: 0x55f36392449e - std::sys_common::backtrace::__rust_begin_short_backtrace::h83c8083dfe102fd8
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/sys_common/backtrace.rs:137
20: 0x55f3639365e1 - std::rt::lang_start::{{closure}}::h56c2ee4de6bc3b6e
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/rt.rs:66
21: 0x55f363b29541 - core::ops::function::impls:: for &F>::call_once::h6a3209f124be2235
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/core/src/ops/function.rs:259
22: 0x55f363b29541 - std::panicking::try::do_call::h88ce358792b64df0
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:373
23: 0x55f363b29541 - std::panicking::try::h6311c259678e50fc
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panicking.rs:337
24: 0x55f363b29541 - std::panic::catch_unwind::h56c5716807d659a1
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/panic.rs:379
25: 0x55f363b29541 - std::rt::lang_start_internal::h73711f37ecfcb277
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/rt.rs:51
26: 0x55f3639365b7 - std::rt::lang_start::h70e31a5ae312b2dc
at /rustc/18bf6b4f01a6feaf7259ba7cdae58031af1b7b39/library/std/src/rt.rs:65
27: 0x55f3639206da - main
28: 0x7fc8776e9b97 - __libc_start_main
29: 0x55f36391a48a - _start
30: 0x0 -
warning: build failed, waiting for other jobs to finish...
error: build failed
error[PYOXIDIZER_BUILD]: command ["cargo", "build", "--target", "x86_64-unknown-linux-gnu", "--target-dir", "/tmp/pyoxidizer.bLb59GulOc4n/build/target", "--bin", "starter-zero", "--no-default-features", "--features", "build-mode-prebuilt-artifacts cpython-link-unresolved-static jemalloc"] exited with code 101
--> ./pyoxidizer.bzl:23:5
|
23 | files.add_python_resource(".", exe)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ add_python_resource

error: command ["cargo", "build", "--target", "x86_64-unknown-linux-gnu", "--target-dir", "/tmp/pyoxidizer.bLb59GulOc4n/build/target", "--bin", "starter-zero", "--no-default-features", "--features", "build-mode-prebuilt-artifacts cpython-link-unresolved-static jemalloc"] exited with code 101

```

**additional notes**:
i have noticed that even when i specify the exact python distribution to use, pyoxidizer will also download the distrobution targetting my own os as in this scenario ``cpython-3.8.6-x86_64-unknown-linux-gnu``

OS: UBUNTU 18.04.3
Architecture: x86_64
PyOxidizer: 0.10.1

Start by rerunning `RUST_BACKTRACE=full MACOSX_DEPLOYMENT_TARGET=10.9 pyoxidizer build` with the shown configuration and inspect the complete output after the generated `pyoxidizer.bzl` and Rust build files are written. Trace which generated build step reports the EOF-in-backquote error; done means the same configuration produces a macOS executable successfully.

Written by the indexing model from the issue text.