bpo-31160: Fix test_builtin.test_input_no_stdout_fileno() #19312
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bpo-31160, bpo-40140, bpo-40155: Fix test_input_no_stdout_fileno() of
test_builtin.
test.support.wait_process() can now be called with exitcode=None to
not check the exit code. Moreover, it now returns the child process
exit code, so it can be checked in the caller.
https://bugs.python.org/issue31160