revert to AC_LIBLTDL_INSTALLABLE for all platforms (AC_LIBTDL_CONVENIENCE breaks Mac OS X too)
revert to AC_LIBLTDL_INSTALLABLE for all platforms (AC_LIBTDL_CONVENIENCE breaks Mac OS X too)

BMJHayward/graphviz,BMJHayward/graphviz,ellson/graphviz,ellson/graphviz,jho1965us/graphviz,pixelglow/graphviz,kbrock/graphviz,kbrock/graphviz,ellson/graphviz,ellson/graphviz,jho1965us/graphviz,kbrock/graphviz,jho1965us/graphviz,MjAbuz/graphviz,kbrock/graphviz,tkelman/graphviz,jho1965us/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,pixelglow/graphviz,MjAbuz/graphviz,tkelman/graphviz,tkelman/graphviz,jho1965us/graphviz,MjAbuz/graphviz,kbrock/graphviz,jho1965us/graphviz,MjAbuz/graphviz,tkelman/graphviz,BMJHayward/graphviz,pixelglow/graphviz,pixelglow/graphviz,kbrock/graphviz,tkelman/graphviz,jho1965us/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,ellson/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,ellson/graphviz,kbrock/graphviz,kbrock/graphviz,pixelglow/graphviz,jho1965us/graphviz,ellson/graphviz,BMJHayward/graphviz,MjAbuz/graphviz,tkelman/graphviz,tkelman/graphviz,MjAbuz/graphviz,BMJHayward/graphviz,pixelglow/graphviz,pixelglow/graphviz,BMJHayward/graphviz,kbrock/graphviz,tkelman/graphviz,ellson/graphviz,ellson/graphviz,pixelglow/graphviz,tkelman/graphviz,BMJHayward/graphviz,jho1965us/graphviz,ellson/graphviz,pixelglow/graphviz,pixelglow/graphviz,kbrock/graphviz,ellson/graphviz,pixelglow/graphviz,MjAbuz/graphviz,tkelman/graphviz,MjAbuz/graphviz,jho1965us/graphviz,kbrock/graphviz,tkelman/graphviz,jho1965us/graphviz