openssl-sys crate doesn't build with vendored feature enabled

The crate builds fine using vanilla cargo.

The build script fails when it is trying to copy the openssl source:
```
Build script process failed with exit code 101
--stdout:
cargo:rustc-cfg=const_fn
cargo:rerun-if-env-changed=X86_64_UNKNOWN_LINUX_GNU_OPENSSL_NO_VENDOR
X86_64_UNKNOWN_LINUX_GNU_OPENSSL_NO_VENDOR unset
cargo:rerun-if-env-changed=OPENSSL_NO_VENDOR
OPENSSL_NO_VENDOR unset

--stderr:
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 2, kind: NotFound, message: "No such file or directory" }', external/crate_index__openssl-src-111.22.0-1.1.1q/src/lib.rs:507:32
```

When I disable sandboxing, the copy succeeds, but the make fails.