[issue3187] os.listdir can return byte strings

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

I have a patch for macpath.py nonetheless.
Tested on Windows (of course ;-) but all functions are pure text 
manipulation, except realpath(). It was much easier than ntpath.py.

I also added tests for three functions which were not exercised at all.

Added file: http://bugs.python.org/file11693/macpath.patch

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