[issue16957] shutil.which() shouldn't look in working directory on unix-y systems

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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nosy: +eric.araujo
stage:  -> patch review
versions: +Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16957>
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