package/libubox: cleanup configure options

Remove unneeded type in configure option's definition.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/libubox/libubox.mk

@@ -15,7 +15,7 @@ LIBUBOX_DEPENDENCIES += lua
 LIBUBOX_CONF_OPTS += -DLUAPATH=$(STAGING_DIR)/usr/lib/lua/5.1 \
 	-DLUA_CFLAGS=-I$(STAGING_DIR)/usr/include
 else
-LIBUBOX_CONF_OPTS += -DBUILD_LUA:BOOL=OFF
+LIBUBOX_CONF_OPTS += -DBUILD_LUA=OFF
 endif
 
 $(eval $(cmake-package))