[issue30028] make test.support.temp_cwd() fork-safe

[INADA Naoki]

INADA Naoki added the comment:

> Oh. If os.getpid() is not always available, the documentation should be updated.

Yes, but CloudABI is not officially supported platform.
They have many patches to run Python on CloudABI. https://github.com/NuxiNL/cloudabi-ports/tree/master/packages/python

How can we document about it?  I hadn't used it.

os.getlogin document says `Availability: Unix, Windows.` [1]
Is it proper way to indicate "there may be some minor platforms which doesn't provide this."?
[1] https://docs.python.org/3.6/library/os.html#os.getlogin

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