gh-123275: Support `-Xgil=1` and `PYTHON_GIL=1` on non-free-threaded builds #123376

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pkg-config 0.29.2_3 is already installed and up-to-date. To reinstall 0.29.2_3, run: brew reinstall pkg-config

xz 5.6.2 is already installed and up-to-date. To reinstall 5.6.2, run: brew reinstall xz

gdbm 1.24 is already installed and up-to-date. To reinstall 1.24, run: brew reinstall gdbm

HOMEBREW_NO_INSTALLED_DEPENDENTS_CHECK is set: not checking for outdated dependents or dependents with broken linkage!