[issue9425] Rewrite import machinery to work with unicode paths

[STINNER Victor]

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

nullimporter_unicode.patch: patch NullImporter_init():
 - use GetFileAttributesW() instead of GetFileAttributesA() for the Windows version to be fully Unicode compliant
 - use "O&" format with PyUnicode_FSConverter instead of "es" with Py_FileSystemDefaultEncoding to accept also bytes filenames and support str with surrogates (PEP 383)

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Added file: http://bugs.python.org/file18434/nullimporter_unicode.patch

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