SDL2 2.0.3


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1515 b412e182-2ed4-4078-95c4-27dc59f57fa9
detact resolver thread if it needs to be stopped


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1516 b412e182-2ed4-4078-95c4-27dc59f57fa9