[issue4761] create Python wrappers for openat() and others

[Antoine Pitrou]

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

> What about Doc/whatsnew/3.3.rst?

This is filled by Raymond (or other people) when the release nears.
No need to care about it in regular commits.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue4761>
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