[issue12989] Consistently handle path separator in Py_GetPath on Windows

[Brian Curtin]

Changes by Brian Curtin <brian at python.org>:


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keywords: +needs review
stage:  -> patch review
type:  -> security
versions:  -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12989>
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