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

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I don't think that we should backport this change to 3.7 and older.

I understand that the change is about supporting Cygwin. My policy to support a new platform is always the same: first fix *all* issues in master, get a working CI, find a core developer responsible to fix all issues specific to this platform, and only after that we can start discussing about backporting specific changes for that platform.

https://pythondev.readthedocs.io/cpython.html#i-want-cpython-to-support-my-platform

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