Unable to oxidize a project including PyYAML on MacOS

Nobody has claimed this yet.

This seems very similar to #66, except with recent MacOS 10.15.6 / Python 3.8.5 / Rust 1.47.0 / PyOxidizer 0.8. A minimal repro is included below.

I tried adding CFLAGS / LDFLAGS to point to Homebrew's libyaml but that didn't change anything - in fact, inspecting the output it doesn't seem like the LDFLAGS are being picked up at all

So then I tried changing that to use RUSTFLAGS instead and now I can see the flag being included in the call to the linker but the error remains the same.

Command line:
```bash
# First tried
pyoxidizer run

# Then tried
CFLAGS=-I/usr/local/opt/libyaml/include LDFLAGS=-L/usr/local/opt/libyaml/lib C_INCLUDE_PATH=/usr/local/opt/libyaml/include pyoxidizer run

# Then tried
RUSTFLAGS="-C link-arg=-L/usr/local/opt/libyaml/lib" pyoxidizer run
```

Config file:
```python
def make_dist():
return default_python_distribution()

def make_exe(dist):
policy = dist.make_python_packaging_policy()
policy.extension_module_filter = "all"
policy.include_distribution_sources = True
policy.include_distribution_resources = True
policy.include_test = False
policy.resources_location = "in-memory"
policy.resources_location_fallback = "filesystem-relative:prefix"

python_config = dist.make_python_interpreter_config()
python_config.run_mode = 'repl'

exe = dist.to_python_executable(
name="pyyamltest",
packaging_policy=policy,
config=python_config,
)
exe.add_python_resources(exe.pip_install(["pyyaml==5.3.1"]))
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()

# END OF COMMON USER-ADJUSTED SETTINGS.
#
# Everything below this is typically managed by PyOxidizer and doesn't need
# to be updated by people.

PYOXIDIZER_VERSION = "0.8.0"
PYOXIDIZER_COMMIT = "UNKNOWN"
```

Result:

```log
error: linking with `cc` failed: exit code: 1
|
= note: "cc" "-m64" "-arch" "x86_64" "-L" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.1wk2720dw3g3msce.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.2d1y3lnp48j3uwob.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.2t5z27ansach1c2v.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.33kofmdzx5avwbep.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.3itk9zxa9fud2oru.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.3q70fjsxp4p280cq.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.4j4twbn4vt6b6p5b.rcgu.o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.51a07efezy1xwufo.rcgu.o" "-o" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/pyyamltest.1nzbksff199ymzd5.rcgu.o" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps" "-L" 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"/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/librand-ec3718a361b5f6e0.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/librand_chacha-ceaa773eb285373d.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libppv_lite86-34785618d9b60ec7.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/librand_core-10ab0b45af2a1e3a.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libgetrandom-b5cccd6541fb04fc.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libmemmap-cc462579004acbb6.rlib" 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"/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libwalkdir-81d3091ed3cfd300.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libsame_file-d2867438838bb20a.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libtempdir-5fa77627f5ad92b5.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libremove_dir_all-897b8f12ef26c5c0.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/librand-14905c904052cc8e.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libpython_packed_resources-c5bf872ab720df26.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/liblazy_static-498b3eb34deaa786.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libmailparse-1037ac79cca85f69.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libquoted_printable-7326894e5e77739a.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libcharset-bec84ec9df504a24.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libencoding_rs-c6860467a6d9a62c.rlib" "/private/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer.OVlgFxSn7PpX/build/target/x86_64-apple-darwin/debug/deps/libcfg_if-3904ea2c495d81ac.rlib" 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"/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_alloc-0c8c4f965200a4aa.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libunwind-79ff3dfdd51a3146.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcfg_if-b7b2fd1e40d1abb6.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liblibc-6f21370607fd8444.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc-9fe3dce1c4c52caa.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/librustc_std_workspace_core-7cd2c32b1bc83b9d.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcore-bda21c4b5d5eb3c7.rlib" "/Users/brsiegel/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-43231a30772c7935.rlib" "-framework" "AppKit" "-framework" "ApplicationServices" "-framework" "Carbon" "-framework" "CoreFoundation" "-framework" "CoreGraphics" "-framework" "CoreServices" "-framework" "IOKit" "-framework" "SystemConfiguration" "-ldl" "-liconv" "-lncurses" "-lpthread" "-lSystem" "-lresolv" "-lc" "-lm" "-L/usr/local/opt/libyaml/lib"
= note: ld: warning: directory not found for option '-L/var/folders/g9/828fv6h94kdf0_c9s91d75g80000gn/T/pyoxidizer-build-exe.PMNGKPT3Zq57'
Undefined symbols for architecture x86_64:
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___pyx_f_5_yaml_7CParser__compose_document in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_7CParser__compose_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_7CParser__compose_scalar_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_7CParser__compose_sequence_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_7CParser__compose_mapping_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_tp_dealloc_5_yaml_CParser in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
...
"_yaml_alias_event_initialize", referenced from:
___pyx_f_5_yaml_8CEmitter__object_to_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_8CEmitter__serialize_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_mapping_start_event_initialize", referenced from:
___pyx_f_5_yaml_8CEmitter__object_to_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_8CEmitter__serialize_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_document_start_event_initialize", referenced from:
___pyx_f_5_yaml_8CEmitter__object_to_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_pw_5_yaml_8CEmitter_13serialize in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_emitter_set_unicode", referenced from:
___pyx_pw_5_yaml_8CEmitter_1__init__ in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_document_end_event_initialize", referenced from:
___pyx_f_5_yaml_8CEmitter__object_to_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_pw_5_yaml_8CEmitter_13serialize in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_scalar_event_initialize", referenced from:
___pyx_f_5_yaml_8CEmitter__object_to_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_8CEmitter__serialize_node in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_parser_parse", referenced from:
___pyx_f_5_yaml_7CParser__parse in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_f_5_yaml_7CParser__parse_next_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_pw_5_yaml_7CParser_15raw_parse in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
"_yaml_stream_end_event_initialize", referenced from:
___pyx_f_5_yaml_8CEmitter__object_to_event in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
___pyx_pw_5_yaml_8CEmitter_11close in libpyembed-62b4ce297691ae25.rlib(libpython.211.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

error: aborting due to previous error

error: could not compile `pyyamltest`.

To learn more, run the command again with --verbose.
error[PYOXIDIZER_BUILD]: cargo build failed
--> ./pyoxidizer.bzl:29:5
|
29 | files.add_python_resource(".", exe)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ add_python_resource

error: cargo build failed
```

Start by reproducing the shown PyOxidizer 0.8 configuration with `pyoxidizer run` on the reported macOS, Python, Rust, and PyYAML versions. Inspect how the build invokes the linker and handles the supplied CFLAGS, LDFLAGS, and RUSTFLAGS; done means the minimal PyYAML project links and runs successfully.

Written by the indexing model from the issue text.