Daemons and fuses now return void.

Functions for starting and stopping daemons and fuses now expect the
type 'void (*func)()'.  Only a few functions in XRogue needed to be
modified to fit.  Determining the type of the argument is left for a
later date.

Building with GCC5 should now produce less than 200 lines of warnings
per game.

srogue/rogue.h

@@ -531,7 +531,7 @@ char *xcrypt(const char *key, const char *setting);
 
 struct delayed_action {
 	int d_type;
-	int (*d_func)();
+	void (*d_func)();
 	int d_arg;
 	int d_time;
 };