[issue5117] os.path.relpath problem with root directory

[Hirokazu Yamamoto]

Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp> added the comment:

In py3k, ntpath is almost fixed. but posixpath is not fixed yet.
ntpath has another problem about case sensitivity. I'll attach
the patch to fix ntpath's case issue and posixpath.

In Py27, ntpath has whole issue still there.

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Added file: http://bugs.python.org/file19106/py3k_fix_relpath.patch

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