Issue #16762: Fix some test_subprocess failures on NetBSD and OpenBSD: kill() returns ESRCH for a zombie process, which is not POSIX-compliant.
Issue #16762: Fix some test_subprocess failures on NetBSD and OpenBSD: kill()
returns ESRCH for a zombie process, which is not POSIX-compliant.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator