[issue32835] Add documention mentioning that Cygwin isn't fully compatible

[Christian Heimes]

Change by Christian Heimes <lists at cheimes.de>:


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keywords: +easy
stage:  -> needs patch
type:  -> enhancement
versions:  -Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32835>
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