[issue12607] subprocess(stdout=..., stderr=sys.stdout) breaks stderr for child

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

i12607_v2.patch: the test fails if Python is compiled with pydebug. Add "err = support.strip_python_stderr(err)" before self.assertEqual(err, b"err") in test_subprocess.py to fix the failure.

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versions:  -Python 2.6, Python 3.1, Python 3.4

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<http://bugs.python.org/issue12607>
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