postfx cleanup


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1757 b412e182-2ed4-4078-95c4-27dc59f57fa9
blurshader cleanups


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1758 b412e182-2ed4-4078-95c4-27dc59f57fa9