[issue40094] Add os.waitstatus_to_exitcode() function

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

See also bpo-40155: "AIX: test_builtin.test_input_no_stdout_fileno() hangs".

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40094>
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