[issue6145] distutils.extension.read_setup_file misinterprets -C switch

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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versions: +Python 3.4, Python 3.5 -Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6145>
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