only register updatecheck libs, when this is enabled

Change-Id: If7b882663ab5cd12d4d9ae01e14162f793d8dc8d
Reviewed-on: https://gerrit.libreoffice.org/6757Reviewed-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>
Tested-by: Björn Michaelsen <bjoern.michaelsen@canonical.com>

Repository.mk

@@ -183,8 +183,10 @@ $(eval $(call gb_Helper_register_libraries_for_install,OOOLIBS,impress, \
 ))
 
 $(eval $(call gb_Helper_register_libraries_for_install,OOOLIBS,onlineupdate, \
-	updatecheckui \
-	updchk \
+	$(if $(ENABLE_ONLINE_UPDATE), \
+		updatecheckui \
+		updchk \
+	) \
 ))
 
 $(eval $(call gb_Helper_register_libraries_for_install,OOOLIBS,gnome, \