Merged revisions 64903 via svnmerge from

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

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  r64903 | brett.cannon | 2008-07-12 18:15:07 -0700 (Sat, 12 Jul 2008) | 6 lines

  dummy_thread.acquire() would return None if no waitflag argument was given. It
  should have returned True.

  Fixes issue #3339. Thanks, Henk Punt for the report and Andrii v. Mishkovskiyi
  for attempting a patch.
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