Make finalize_server_connect() static

It is only called within server.c.

include/server.h

@@ -360,7 +360,6 @@ ChannelList	*BX_get_server_channels		(int);
 	void	set_who_queue_top		(int, WhoEntry *);
 	WhoEntry *who_queue_top			(int);
 
-	int finalize_server_connect(int, int, int);
 	int next_server(int);
 	void	do_idle_server (void);