[issue12196] add pipe2() to the os module

[Roundup Robot]

Roundup Robot <devnull at devnull> added the comment:

New changeset 866d959dea8e by Charles-François Natali in branch 'default':
Issue #12196: Add PIPE_MAX_SIZE to test.support, constant larger than the
http://hg.python.org/cpython/rev/866d959dea8e

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nosy: +python-dev

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