[issue17557] test_getgroups of test_posix can fail on OS X 10.8 if more than 16 groups

[Ned Deily]

Ned Deily added the comment:

Thanks for the patch, Mateusz. That basic approach should work on all current releases (although it would be nice if Apple also fixed the problem).  I'll test it on the various releases.  If you haven't already, please submit a contributor form as described in the developer's guide (http://docs.python.org/devguide/patch.html#licensing).

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stage:  -> patch review

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