[issue31160] Enhance support.reap_children()

[STINNER Victor]

STINNER Victor added the comment:

> New changeset 4baca1b0f7325032598cd38e7ceffc79b616d255 by Victor Stinner in branch 'master':
> bpo-31160: Fix test_builtin for zombie process (#3043)

This change introduced a regression:

http://buildbot.python.org/all/builders/AMD64%20Debian%20root%203.x/builds/1159/steps/test/logs/stdio

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FAIL: test_input_no_stdout_fileno (test.test_builtin.PtyTests)
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Traceback (most recent call last):
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_builtin.py", line 1624, in test_input_no_stdout_fileno
    lines = self.run_child(child, b"quux\r")
  File "/root/buildarea/3.x.angelico-debian-amd64/build/Lib/test/test_builtin.py", line 1573, in run_child
    self.assertEqual(status, 0)
AssertionError: 1 != 0

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<http://bugs.python.org/issue31160>
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