[issue42692] Build fails on macOS when compiler doesn't define __has_builtin

[Ned Deily]

Ned Deily <nad at python.org> added the comment:


New changeset eedeaef1f22d27264ce9b031da80fe2485e85e69 by Miss Islington (bot) in branch '3.9':
bpo-42692: fix __builtin_available check on older compilers (GH-23873) (GH-24090)
https://github.com/python/cpython/commit/eedeaef1f22d27264ce9b031da80fe2485e85e69


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