update broken PKG_UPDATE rules, handle missing update rules * Makefile.in: add handling for packages with no update rule * src/gtk2.mk, src/gtk3.mk, src/libvpx.mk, src/taglib.mk, src/hunspell.mk, src/vala.mk : use github tags for version info * src/llvm.mk: add '?' to update url * src/openscenegraph.mk: update SED rule for version extraction * src/pthread-stubs.mk, src/qt5.mk, src/renderproto.mk, src/sm.mk, src/s2tc.mk, src/util-macros.mk: added dummy PKG_UPDATE rule * src/qscintilla.mk: change search name for version extraction * src/qtbase.mk: use short pkg version in update path * src/suitesparse.mk: update change in main url/version url * src/tre.mk: update download page link * src/vmime.mk: update download and update url * src/wget.mk, src/xapian-core.mk: update url, sed rule * src/wt.mk: update to use github download/update * src/src-msys-libcrypt.mk: update sed rule

diff -uNr a/src/sosfilt.cc b/src/sosfilt.cc
--- a/src/sosfilt.cc	2015-05-25 20:22:36.846411059 -0400
+++ b/src/sosfilt.cc	2018-01-09 15:50:16.018191246 -0500
@@ -13,7 +13,6 @@
 // You should have received a copy of the GNU General Public License along with
 // this program; if not, see <http://www.gnu.org/licenses/>.
 
-#include <octave/config.h>
 #include <octave/defun-dld.h>
 #include <octave/error.h>
 #include <octave/gripes.h>
diff -uNr a/src/upfirdn.cc b/src/upfirdn.cc
--- a/src/upfirdn.cc	2015-05-25 20:22:36.846411059 -0400
+++ b/src/upfirdn.cc	2018-01-09 15:50:13.514305277 -0500
@@ -13,7 +13,6 @@
 // You should have received a copy of the GNU General Public License along with
 // this program; if not, see <http://www.gnu.org/licenses/>.
 
-#include <octave/config.h>
 #include <octave/defun-dld.h>
 #include <octave/error.h>
 #include <octave/gripes.h>