[issue14242] Make subprocess.Popen aware of $SHELL

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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nosy: +gregory.p.smith
versions:  -Python 2.7, Python 3.1, Python 3.2, Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14242>
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