[issue8725] Python3: use ASCII for the file system encoding on initfsencoding() failure

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at haypocalc.com>:


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dependencies: +Create PyUnicode_EncodeFSDefault() function, Python3 doesn't support locale different than utf8 and an non-ASCII path (POSIX)
nosy: +Arfrever, lemburg, loewis, pitrou

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue8725>
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