Introduce accumulate_int and accumulate_unicast_int for 32-bits values

message.c

@@ -632,6 +632,13 @@ accumulate_short(struct interface *ifp, unsigned short value)
     ifp->buffered += 2;
 }
 
+static void
+accumulate_int(struct interface *ifp, unsigned int value)
+{
+    DO_HTONL(ifp->sendbuf + ifp->buffered, value);
+    ifp->buffered += 4;
+}
+
 static void
 accumulate_bytes(struct interface *ifp,
                  const unsigned char *value, unsigned len)
@@ -685,6 +692,13 @@ accumulate_unicast_short(struct neighbour *neigh, unsigned short value)
     unicast_buffered += 2;
 }
 
+static void
+accumulate_unicast_int(struct neighbour *neigh, unsigned int value)
+{
+    DO_HTONL(unicast_buffer + unicast_buffered, value);
+    unicast_buffered += 4;
+}
+
 static void
 accumulate_unicast_bytes(struct neighbour *neigh,
                          const unsigned char *value, unsigned len)