ring theft

Prevent monkeys from stealing any ring which the hero can't remove due
to it being stuck inside the grip of a cursed weapon.  Nymphs can still do
so though.  From a bug report.

doc/fixes34.4

@@ -86,6 +86,7 @@ interrupt current activity during certain stages of petrification or vomiting
 warning about bad food didn't recognize tin of Medusa meat
 eating tainted Medusa corpse caused food poisioning instead of petrification
 avoid potential stale pointer use after magic bag explosion
+monkeys can't steal rings worn under cursed weapon
 
 
 Platform- and/or Interface-Specific Fixes

src/steal.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)steal.c	3.5	2004/11/11	*/
+/*	SCCS Id: @(#)steal.c	3.5	2005/02/09	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -315,7 +315,11 @@ gotobj:
 	    else if (otmp == uquiver || (otmp == uswapwep && !u.twoweap))
 		ostuck = FALSE;	/* not really worn; curse doesn't matter */
 	    else
-		ostuck = (otmp->cursed && otmp->owornmask);
+		ostuck = ((otmp->cursed && otmp->owornmask) ||
+			  /* nymphs can steal rings from under
+			     cursed weapon but animals can't */
+			  (otmp == uright && welded(uwep)) ||
+			  (otmp == uleft && welded(uwep) && bimanual(uwep)));
 
 	    if (ostuck || !can_carry(mtmp, otmp)) {
 		static const char * const how[] = { "steal","snatch","grab","take" };