[issue17634] Win32: shutil.copy leaks file handles to child processes

[Antoine Pitrou]

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


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nosy: +haypo, hynek, sbt, tarek
versions: +Python 3.4 -Python 2.6, Python 3.1, Python 3.2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17634>
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