[issue9425] Rewrite import machinery to work with unicode paths

[STINNER Victor]

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

Note about _Py_wchar2char(): it is possible to convert character by character (instead of working on substrings) because the input string doesn't contain surrogate pairs. _Py_char2wchar() ensures the the output string doens't contain surrogate pairs: if a byte sequence produces a surrogate pairs, the byte sequence is encoded using the surrogateescape error handler (U+DC00..U+DCFF range). I should add this note in _Py_wchar2char() comment.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9425>
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