[issue10812] Add some posix functions

[Ross Lagerwall]

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

This new patch, updated against the tip for 3.3:

Shares the iov_setup and iov_cleanup code, py_parse_off_t with sendfile().

Removes gethostid and sethostid since they're deprecated.

I think I was correct with referring to utime() since I was referring to the python function, os.utime().

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