- Fix the bug described here http://savannah.cern.ch/bugs/?32815

  It batch mode it was not possible to generate a bitmap file (gif, jpeg etc..)
  with a filename containing ")", "(", "]" or "[".


git-svn-id: http://root.cern.ch/svn/root/trunk@21775 27541ba8-7e3a-0410-8455-c3a389f83636