don't need sigusr2 in master


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1918 b412e182-2ed4-4078-95c4-27dc59f57fa9
reset hud shader in rendertexturepanel


git-svn-id: svn://svn.tuxfamily.org/svnroot/tesseract/main@1919 b412e182-2ed4-4078-95c4-27dc59f57fa9