[issue8110] subprocess.py doesn't correctly detect Windows machines

[Zachary Ware]

Change by Zachary Ware <zachary.ware at gmail.com>:


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nosy: +giampaolo.rodola, gregory.p.smith
versions: +Python 3.6, Python 3.7, Python 3.8 -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue8110>
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