contrib: added target for glib since this is a required dependency to compile...

contrib: added target for glib since this is a required dependency to compile fluidsynth (refs #10014)

contrib/src/glib/SHA512SUMS

+f31531060d898dbe05e71ffc4d057f5a703106674e68c28ad2346d227304ef9454736beaf653f27553ed5397caac8baf3d76d3b31b062898762e5cf4e24ff0e0  glib-2.38.2.tar.xz

contrib/src/glib/rules.mak

+# GLIB
+GLIB_VERSION := 2.38
+GLIB_MINOR_VERSION := 2.38.2
+GLIB_URL := http://ftp.gnome.org/pub/gnome/sources/glib/$(GLIB_VERSION)/glib-$(GLIB_MINOR_VERSION).tar.xz
+
+PKGS += glib
+ifeq ($(call need_pkg,"glib-2.0 gthread-2.0"),)
+PKGS_FOUND += glib
+endif
+
+DEPS_glib = ffi $(DEPS_ffi)
+
+$(TARBALLS)/glib-$(GLIB_MINOR_VERSION).tar.xz:
+	$(call download,$(GLIB_URL))
+
+.sum-glib: glib-$(GLIB_MINOR_VERSION).tar.xz
+
+glib: glib-$(GLIB_MINOR_VERSION).tar.xz .sum-glib
+	$(UNPACK)
+	$(MOVE)
+
+.glib: glib
+	$(RECONF)
+	cd $< && $(HOSTVARS) ./configure $(HOSTCONF)
+	cd $< && $(MAKE) install
+	touch $@