[issue9425] Rewrite import machinery to work with unicode paths

[STINNER Victor]

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

I tried to fix Mac OS X (TESTFN_UNENCODABLE) with r84035, but I don't have access to Mac OS X to test and my patch was not correct. It should now be ok with r84080.

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