[issue14689] make PYTHONWARNINGS variable work in libpython

[Joannah Nanjekye]

Joannah Nanjekye <nanjekyejoannah at gmail.com> added the comment:

@petere do you want to open a PR with your patch here: https://github.com/python/cpython/pulls

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nosy: +nanjekyejoannah

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue14689>
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