[issue16104] Use multiprocessing in compileall script

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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stage:  -> patch review
type:  -> enhancement
versions: +Python 3.5 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16104>
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