Fix issue where failed tests on Windows don't return errorlevel > 0.
Fix issue where failed tests on Windows don't return errorlevel > 0.

* subversion/tests/cmdline/svntest/main.py
  (SpawnTest.run): the exitcode of a spawned process on Windows will not be 
   correct, so check for patterns of type 'FAIL: ' on stdout of the process.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion