don't fail if there are no modules.mk under ./target/linux/

SVN-Revision: 12675

package/kernel/Makefile

@@ -44,5 +44,5 @@ endef
 
 $(eval $(if $(DUMP),,$(call BuildPackage,kernel)))
 
-include $(TOPDIR)/target/linux/*/modules.mk
+-include $(TOPDIR)/target/linux/*/modules.mk
 include ./modules/*.mk