gluon-mesh-batman-adv-core: respondd: add uci.h include

This include wasn't actually missing, but well hidden behind the iwinfo.h
include. Make this more obvious.

package/gluon-mesh-batman-adv-core/src/respondd.c

@@ -29,6 +29,7 @@
 #include <iwinfo.h>
 #include <json-c/json.h>
 #include <libgluonutil.h>
+#include <uci.h>
 
 #include <alloca.h>
 #include <glob.h>