[3.14] gh-123681: Check NORMALIZE_CENTURY behavior at runtime; require C99 (GH-136022) (GH-137947)

A runtime check is needed to support cross-compiling.

Remove the _Py_NORMALIZE_CENTURY macro.
Remove _pydatetime.py's _can_support_c99.
(cherry picked from commit 719e5c3f71)

Co-authored-by: Petr Viktorin <encukou@gmail.com>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2025-10-07 19:59:06 +02:00 committed by GitHub
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commit 7d9b2671c6
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8 changed files with 48 additions and 191 deletions

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Check the ``strftime()`` behavior at runtime instead of at the compile time
to support cross-compiling.
Remove the internal macro ``_Py_NORMALIZE_CENTURY``.