[issue5117] os.path.relpath problem with root drive directory on windows

[Hirokazu Yamamoto]

Changes by Hirokazu Yamamoto <ocean-city at m2.ccsnet.ne.jp>:


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versions: +Python 2.7, Python 3.0, Python 3.1

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue5117>
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