Remove exported function create_server_list()

The guts of this function doesn't need to be in server.c - it only uses extern server functions so it
makes sense just to move it into the body of function_servers(), the only caller.

That means it's no longer accessible for loadable modules, but it isn't much use for them anyway.  They
can always directly access the server list if they need that info.

(Requires rolling the module table version).

include/server.h

@@ -216,7 +216,6 @@ extern	SGroup	*server_group_list;
 	char	*BX_get_server_itsname (int);
 	char	*get_server_pass (int);
 	int	BX_find_in_server_list (char *, int);
-	char	*BX_create_server_list (char *);
 	void	BX_set_server_motd (int, int);
 	int	BX_get_server_motd (int);
 	int	BX_get_server_operator (int);