[issue12196] add pipe2() to the os module

[STINNER Victor]

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

Your last support_linux_version.diff patch looks good. If you are motivated, this new function can also be added to test.support of Python 3.2 (test_socket.py has the original linux_version() function).

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<http://bugs.python.org/issue12196>
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