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.

xrogue/passages.c

@@ -142,7 +142,7 @@ void
 conn(int r1, int r2)
 {
     register struct room *rpf, *rpt = NULL;
-    register char rmt;
+    register signed char rmt;
     register int distance = 0, max_diag, offset = 0, i;
     register int rm;
     int turns[3], turn_dist[3];