Merged revisions 80144 via svnmerge from

Merged revisions 80144 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r80144 | r.david.murray | 2010-04-17 01:26:26 -0400 (Sat, 17 Apr 2010) | 8 lines

  Issue #3864: Skip three test_signal tests on freebsd6 due to platform bug.

  Two itimer tests and an interprocess signal test fail on FreeBSD 6 if
  any test that starts a thread runs before test_signal.  Since FreeBSD7
  does not show this behavior, the bug is most likely a platform bug,
  so this patch just skips the failing tests on freebsd6.
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