[issue9425] Rewrite import machinery to work with unicode paths

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

It breaks test_unicode_file on OS X, too:

  File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/test_unicode_file.py", line 8, in <module>
    from test.support import (run_unittest, rmtree,
ImportError: cannot import name TESTFN_UNENCODABLE

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