package/libgtk3: remove schema compile hook

Dropping the need for this package to compile any schemas as the
libglib2 package (a dependency) already handles this during target
finalization.

Signed-off-by: James Knight <git@jdknight.me>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libgtk3/libgtk3.mk

@@ -87,13 +87,6 @@ else
 LIBGTK3_CONF_OPTS += -Dtests=false -Dinstalled_tests=false
 endif
 
-define LIBGTK3_COMPILE_GLIB_SCHEMAS
-	$(HOST_DIR)/bin/glib-compile-schemas \
-		$(TARGET_DIR)/usr/share/glib-2.0/schemas
-endef
-
-LIBGTK3_POST_INSTALL_TARGET_HOOKS += LIBGTK3_COMPILE_GLIB_SCHEMAS
-
 # gtk+ >= 3.10 can build a native version of gtk-update-icon-cache if
 # --enable-gtk2-dependency=no is set when invoking './configure'.
 #