gh-111178: fix UBSan failures in `Modules/_functoolsmodule.c`#129778

Merged

encukou merged 6 commits intopython:mainfrom

picnixz:fix/ubsan/functools-111178

Feb 21, 2025

Commits on Feb 7, 2025

Merge remote-tracking branch 'upstream/main' into fix/ubsan/functools-111178
picnixz
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Commits on Feb 8, 2025

Do not add an underscore to the macro if none is needed.
picnixz
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