[issue7900] posix.getgroups() failure on Mac OS X

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

Martin's solution works.  I don't think we need to worry about non-gcc compilers on OSX.  I am attaching a patch with tests where getgroups to id -G comparison test is skipped if id -G shows more than 16 groups.

Some of the added tests are skipped for non-privileged user.

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Added file: http://bugs.python.org/file17751/issue7900-trunk.diff

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