core: Add missing include for network interface tracking

src/main.c

@@ -27,6 +27,7 @@
 #include <stdlib.h>
 #include <ell/ell.h>
 
+#include "src/netdev.h"
 #include "src/kdbus.h"
 
 static void signal_handler(struct l_signal *signal, uint32_t signo,

src/netdev.c

@@ -29,6 +29,8 @@
 #include <net/if.h>
 #include <ell/ell.h>
 
+#include "src/netdev.h"
+
 struct netdev_data {
 	uint32_t index;
 	uint32_t flags;