[issue7301] Add environment variable $PYTHONWARNINGS

[Stefan Krah]

Stefan Krah <stefan-usenet at bytereef.org> added the comment:

The changes in main.c in r79881 don't look right:

strtok() is used on the string returned by getenv(), which must not
be modified.

Also (and this admittedly cosmetic), perhaps use a static buffer like
wchar_t warning[128] or use a single allocation before the for loop.
What is the maximum length for a single warning?

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nosy: +skrah

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