[issue8610] Python3/POSIX: errors if file system encoding is None

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

"I think that using ASCII is a safer choice in case of errors. (...) Ouch, that was a poor choice."

Ok, you conviced me with your PYTHONFSENCODING suggestion (#8622). Can you review my last patch please?

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