macos-amd64: don't hard-fail the checked-in-binary check when tcc.exe isn't the permanent legacy build - #82

Process completed with exit code 1.

thirdparty/tcc/lib/libgc.a is not a well-formed archive (ar t failed) right after being rebuilt - this is a real regression in the bdwgc build, not the known tcc archive-parsing limitation.

Process completed with exit code 1.

The checked-in tcc.exe/libgc.a failed with the known aggregate count, but the direct crash.c compile error does NOT match the known broken-libc.dylib-symlink signature exactly (abnormally terminated, or accompanied by another error) - this looks like a different, unexpected regression: