Add additional dependancies on fontconfig so that a rebuild will

be forced when the patch or the Makefile itself changes - a previous
change hasn't been picked up by buildbot, and it hasn't been
corrected on win32 builds.

extras/contrib/src/Makefile

@@ -437,7 +437,7 @@ DISTCLEAN_PKG += libiconv-$(LIBICONV_VERSION).tar.gz
 fontconfig-$(FONTCONFIG_VERSION).tar.gz:
 	$(WGET) $(FONTCONFIG_URL)
 
-fontconfig: fontconfig-$(FONTCONFIG_VERSION).tar.gz
+fontconfig: fontconfig-$(FONTCONFIG_VERSION).tar.gz Makefile Patches/fontconfig.patch
 	$(EXTRACT_GZ)
 	patch -p0 < Patches/fontconfig.patch