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

[Roundup Robot]

Roundup Robot added the comment:

New changeset a09ae70f3489 by Victor Stinner in branch '2.7':
Issue #22636: Avoid using a shell in the ctypes.util module
https://hg.python.org/cpython/rev/a09ae70f3489

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<http://bugs.python.org/issue22636>
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