Merged revisions 83088 via svnmerge from

Merged revisions 83088 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r83088 | ronald.oussoren | 2010-07-23 14:53:51 +0100 (Fri, 23 Jul 2010) | 8 lines

  This fixes issue7900 by adding code that deals
  with the fact that getgroups(2) might return
  more that MAX_GROUPS on OSX.

  See the issue (and python-dev archives) for the
  gory details. Summarized: OSX behaves rather oddly
  and Apple says this is intentional.
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