allow jpg support in diffimg. remove test for HAVE_HAVE_LIBJPEG - Sergej Pupykin
allow jpg support in diffimg. remove test for HAVE_HAVE_LIBJPEG - Sergej Pupykin

ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz