[issue32238] Handle "POSIX" in the legacy locale detection

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

In Python 3.8, if the LC_CTYPE is "POSIX", the default stdio error handler is now "surrogateescape" instead of "strict", and the UTF-8 is now enabled. In short, LC_CTYPE="POSIX" now behaves as LC_CTYPE="C".

This change impacts at least FreeBSD. If I correctly, if there is no LC_ALL, LC_CTYPE or LANG environment variable on FreeBSD, the LC_CTYPE locale is "POSIX".

See bpo-34485, bpo-19977 and the "POSIX locale on FreeBSD" section of my article:
https://vstinner.github.io/python3-locales-encodings.html

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