[issue9425] Rewrite import machinery to work with unicode paths

[STINNER Victor]

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

r83989 creates _Py_wchar2char() function (_Py_wchar2char-2.patch).

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