[issue775964] fix test_grp failing on RedHat 6.2

[Tres Seaver]

Tres Seaver <tseaver at agendaless.com> added the comment:

I don't have a host where I actually use netgroups in /etc/groups, and so can't provoke the bug::

  $ hg branch
  release26-maint
  $ make
  ...
  $ ./python -E -tt Lib/test/regrtest.py test_grp
  test_grp
  1 test OK.

I can verify that the patch still applies to the 'release26-maint' branch::

  $ patch -p0 < /tmp/grp.diff 
  patching file Modules/grpmodule.c
  Hunk #1 succeeded at 134 (offset 12 lines).

and that the tests still pass aftewards::

  $ make
  ...
  $ ./python -E -tt Lib/test/regrtest.py test_grp
  test_grp
  1 test OK.

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nosy: +tseaver

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<http://bugs.python.org/issue775964>
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