[issue12196] add pipe2() to the os module

[Charles-François Natali]

Charles-François Natali <neologix 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).

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Added file: http://bugs.python.org/file22265/pipe2_arg.diff

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