update: more PKG_UPDATE updates, added update-octaveforge target * src/libxml++.mk, src/libxml2.mk, src/libxshmfence.mk, src/libxslt.mk, src/llvm.mk, src/mingwrt.mk, src/msys-libcrypt.mk, src/msys-libopenssl.mk, src/muparser.mk, rc/nsis.mk: update PKG_UPDATE rule * src/of-actuarial.mk, src/of-communications.mk, src/of-control.mk, src/of-data-smoothing.mk, src/of-database.mk, src/of-dataframe.mk, src/of-dicom.mk, src/of-financial.mk, src/of-fits.mk, src/of-fl-core.mk, src/of-fuzzy-logic-toolkit.mk, src/of-ga.mk, src/of-ga.mk, src/of-general.mk, src/of-generate_html.mk, src/of-geometry.mk, src/of-gsl.mk, src/of-image.mk, src/of-instrument-control.mk, src/of-interval.mk, src/of-io.mk, src/of-linear-algebra.mk, src/of-lssa.mk, src/of-ltfat.mk, src/of-mapping.mk, src/of-miscellaneous.mk, src/of-nan.mk, src/of-netcdf.mk, src/of-nurbs.mk, src/of-ocs.mk, src/of-octcdf.mk, src/of-odepkg.mk, src/of-optim.mk, src/of-quaternion.mk, src/of-signal.mk, src/of-sockets.mk, src/of-sparsersb.mk, src/of-specfun.mk, src/of-splines.mk, src/of-statistics.mk, src/of-stk.mk, src/of-strings.mk, src/of-struct.mk, src/of-tisean.mk, src/of-tsa.mk, src/of-video.mk, src/of-windows.mk, src/of-zeromq.mk, src/of-queueing.mk, : use $(OCTAVE_FORGE_PKG_UPDATE) * Makefile.in: added OCTAVE_FORGE_PKG_UPDATE macro, added update-octaveforge target

--- a/src/libxshmfence.mk	Wed Nov 22 08:16:51 2017 -0500
+++ b/src/libxshmfence.mk	Wed Nov 22 15:26:02 2017 -0500
@@ -10,6 +10,13 @@
 $(PKG)_URL      := http://www.x.org/archive/individual/lib/$($(PKG)_FILE)
 $(PKG)_DEPS     := xproto
 
+define $(PKG)_UPDATE
+    $(WGET) -q -O- 'http://www.x.org/archive/individual/lib/' | \
+    $(SED) -n 's|.*href="libxshmfence-\([0-9\.]*\).tar.*|\1|p' | $(SORT) -V | \
+    tail -1
+endef
+
+
 ifeq ($(MXE_WINDOWS_BUILD),yes)
   define $(PKG)_BUILD
   endef