[issue46513] AC_C_CHAR_UNSIGNED from configure.ac confuses GCC 12+ by defining __CHAR_UNSIGNED__

[Christian Heimes]

Change by Christian Heimes <lists at cheimes.de>:


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pull_requests: +29093
pull_request: https://github.com/python/cpython/pull/30914

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<https://bugs.python.org/issue46513>
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