[3.9] bpo-42598: Fix implicit function declarations in configure (GH-23690)#23756
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This is invalid in C99 and later and is an error with some compilers
(e.g. clang in Xcode 12), and can thus cause configure checks to
produce incorrect results.
(cherry picked from commit 674fa0a)
Co-authored-by: Joshua Root jmr@macports.org
https://bugs.python.org/issue42598