[issue9425] Rewrite import machinery to work with unicode paths

[STINNER Victor]

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

r84012 creates _Py_stat(). It is a little bit different than the attached patch (_Py_stat.patch): it doesn't clear Python exception on unicode conversion error.

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<http://bugs.python.org/issue9425>
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