util: drop missing.h from util.h

src/libsystemd-network/lldp-neighbor.c

@@ -7,6 +7,7 @@
 #include "in-addr-util.h"
 #include "lldp-internal.h"
 #include "lldp-neighbor.h"
+#include "missing.h"
 #include "unaligned.h"
 
 static void lldp_neighbor_id_hash_func(const LLDPNeighborID *id, struct siphash *state) {

src/libsystemd-network/lldp-network.c

@@ -5,6 +5,7 @@
 
 #include "fd-util.h"
 #include "lldp-network.h"
+#include "missing.h"
 #include "socket-util.h"
 
 int lldp_network_bind_raw_socket(int ifindex) {