libubox: add build dependency on lua

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34022 3c298f89-4303-0410-b956-a3cf2f4a3e73

package/libs/libubox/Makefile

@@ -17,6 +17,8 @@ PKG_LICENSE_FILES:=
 
 PKG_MAINTAINER:=Felix Fietkau <nbd@openwrt.org>
 
+PKG_BUILD_DEPENDS:=lua
+
 include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/cmake.mk