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

[Martin Panter]

Martin Panter added the comment:

FTR the Python 2.3 compatibility restriction was lifted; see <https://mail.python.org/pipermail/python-dev/2016-May/144502.html>.

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