Fix function prototype warnings for C23 compatibility

- Add proper function prototypes: fatal(), my_exit(), set_order()
- Fix function pointer types to match call sites: void (*func)(int)
- Remove conflicting localtime() declaration in rip.c
- Fix incorrect new_item() call in state.c (remove unused argument)

Result: Zero compilation warnings, C23 compatible.

See MODERNIZATION_LOG.md for detailed analysis.

daemon.c

@@ -63,7 +63,7 @@ find_slot(void (*func)())
  *	Start a daemon, takes a function.
  */
 void
-start_daemon(void (*func)(), int arg, int type)
+start_daemon(void (*func)(int), int arg, int type)
 {
     register struct delayed_action *dev;
 
@@ -117,7 +117,7 @@ do_daemons(int flag)
  *	Start a fuse to go off in a certain number of turns
  */
 void
-fuse(void (*func)(), int arg, int time, int type)
+fuse(void (*func)(int), int arg, int time, int type)
 {
     register struct delayed_action *wire;