[issue12196] add pipe2() to the os module

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> Hmm, thinking about it, I don't see any reason to make the flags argument optional.
> Here's a patch changing that (also, pipe2 is now declared as METH_O instead of METH_VARARGS).

Looks good to me.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12196>
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