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

[Serhiy Storchaka]

Serhiy Storchaka <storchaka at gmail.com> added the comment:

Perhaps it is better not export these functions in the `os` module, leaving them in `posix`?

In addition, `stat` and `lstat` is not very thin wrappers (especially on Windows) given that they are working with `bytes` and with `str`.

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<http://bugs.python.org/issue4761>
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