fix build on FreeBSD: eliminate implicitly declared functions

Change-Id: I4f7222f19e4d7129a5cef828a28dd12a40824a59

src/gsup_server.c

@@ -26,6 +26,7 @@
 #include <osmocom/abis/ipaccess.h>
 
 #include "gsup_server.h"
+#include "gsup_router.h"
 
 static void osmo_gsup_server_send(struct osmo_gsup_conn *conn,
 			     int proto_ext, struct msgb *msg_tx)

src/gsup_server.h

@@ -32,6 +32,8 @@ struct osmo_gsup_conn {
 
 
 int osmo_gsup_conn_send(struct osmo_gsup_conn *conn, struct msgb *msg);
+int osmo_gsup_conn_ccm_get(const struct osmo_gsup_conn *clnt, uint8_t **addr,
+			   uint8_t tag);
 
 struct osmo_gsup_server *osmo_gsup_server_create(void *ctx,
 					const char *ip_addr,

src/hlr.c

@@ -116,6 +116,8 @@ struct lu_operation {
 	uint8_t *peer;
 };
 
+void lu_op_tx_insert_subscr_data(struct lu_operation *luop);
+
 void lu_op_statechg(struct lu_operation *luop, enum lu_state new_state)
 {
 	enum lu_state old_state = luop->state;