[issue10812] Add some posix functions

[Ross Lagerwall]

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

A few small fixes for OS X:
It has no return value for sethostid() and sets different errno if permission denied,
waitid() is broken - so its disabled,
the timeval struct used in futimes and lutimes is defined slightly differently.

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Added file: http://bugs.python.org/file20461/10812_v6.patch

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