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

[Ross Lagerwall]

Ross Lagerwall <rosslagerwall at gmail.com> added the comment:

New patch *should* have fixed up reference counting and version tags.

I standardized all the error calls to posix_error.

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Added file: http://bugs.python.org/file20137/i4761_v4.patch

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