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

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

We don't (can't) document everything we're *not* compatible with, we can only realisticly document what we support.  I thought we did that, but all I can find at the moment is PEP 11, which you are correct, does not list cygwin as a no-longer-supported platform (although we'd like to support it, see the many issues in this tracker about it).

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nosy: +r.david.murray

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