[issue22636] avoid using a shell in ctypes.util: replace os.popen with subprocess

[Martin Panter]

Martin Panter added the comment:

Marking for bug fix in 2.7, requested in Issue 25751.

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type: enhancement -> behavior
versions: +Python 2.7, Python 3.4, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22636>
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