Merged revisions 84857,84870,84875 via svnmerge from

Merged revisions 84857,84870,84875 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r84857 | hirokazu.yamamoto | 2010-09-17 17:53:31 +0900 | 1 line

  Let's see if tcl/tk test runs on windows buildbot with this fix.
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  r84870 | hirokazu.yamamoto | 2010-09-18 09:31:44 +0900 | 3 lines

  regrtest.py now runs python in build/test_python_xxx. (deeper than here)
  So failed to load tcl/tk dll because $(dist)/tcltk/bin was set to PATH as
  relative path. (Windows)
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  r84875 | hirokazu.yamamoto | 2010-09-18 13:02:52 +0900 | 1 line

  Applied r84870 to older compilers.
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