[issue16993] shutil.which() should preserve path case

[Stefan Krah]

Stefan Krah added the comment:

Serhiy, test_pathext_checking still fails on many Windows buildbots:

http://buildbot.python.org/all/waterfall?category=3.x.stable&category=3.x.unstable

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nosy: +skrah
status: closed -> open

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<http://bugs.python.org/issue16993>
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