[issue12196] add pipe2() to the os module

[STINNER Victor]

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

> If've added a test to skip this test on Linux kernels older than 2.6.27:
> like O_CLOEXEC, the problem is that the libc defines pipe2() while the
> kernel doesn't support it, so when syscall() is called it bails out with
> ENOSYS. (This buildbot should really have its libc/kernel upgraded...)

You may add the issue number of your commit changelog, so a comment is 
generated directly in the issue.

support.linux_version() may be changed for requires_linux_version(2, 6, 27), 
but linux_version() is always used in tests to check the Linux version. 
requires_linux_version() would only raise a SkipTest if the OS is Linux and if 
the kernel is lesser than the specified version.

By the way, I like the new os.pipe2() function! You may want to document it in 
the "What's new in Python 3.3" doc (just mention the new function, the 
document will be rephrased later).

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