[issue36624] cleanup the stdlib and tests with regard to sys.platform usage

[STINNER Victor]

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

I tried to add constants to test.support once to identify operating systems, nbut I had to revert the change. I am not sure that there is any problem here. Leaving the code unchanged is also fine :-)

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nosy: +vstinner

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