Fix many compiler warnings.

There should only be two changes in behavior:

arogue7/fight.c, arogue7/fight.c: a to-hit bonus is now correctly
applied to characters who are not monks instead of monks who are not
empty-handed.

urogue/fight.c: fixed an interaction with the "debug" macro that could
cause the wrong message to be displayed.

srogue/rings.c

@@ -288,7 +288,7 @@ int
 ring_eat(void)
 {
 	reg struct object *lb;
-	reg int hand, i, howmuch;
+	reg int i, howmuch;
 	bool addit;
 
 	howmuch = 0;