Merged revisions 78718 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r78718 | gregory.p.smith | 2010-03-06 01:35:19 -0600 (Sat, 06 Mar 2010) | 3 lines

  Call setreuid and setregid in a subprocess to avoid altering the test runner's
  process state.  Should fix issue8045.
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