rogue4: fix most GCC5 warnings.

Converting all function definitions to ANSI style accounts for most of
the change.  This has exposed other problems, such as daemons not
actually being their stated type, that will require more careful
solutions.

rogue4/extern.h

@@ -52,17 +52,9 @@ extern WINDOW	*hw;
  * Function types
  */
 
-char	*charge_str(), *ctime(), *getenv(), *inv_name(),
-	*killname(), *nothing(), *num(), *ring_num(),
-	*tr_name(),
-	*unctrol(), *vowelstr();
+char	*ctime(), *getenv();
 
-void    leave(int), quit(int), tstp(), auto_save(int), endit(int);
-int	doctor(), nohaste(),
-	rollwand(), runners(), sight(), stomach(), swander(),
-	turn_see(), unconfuse(), unsee();
-
-void	checkout();
+void    tstp(), endit(int);
 
 long	lseek();