monster strategy fix

From the newsgroup:  using #chat to talk to a "meditating"
monster like quest nemesis or Medusa could elicilit responses
without waking it up (at least if you moved fast enough enough
to probe it before it got its next turn).

src/sounds.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)sounds.c	3.4	2001/02/14	*/
+/*	SCCS Id: @(#)sounds.c	3.4	2002/05/06	*/
 /*	Copyright (c) 1989 Janet Walz, Mike Threepoint */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -902,6 +902,9 @@ dochat()
 	return(0);
     }
 
+    /* if this monster is waiting for something, prod it into action */
+    mtmp->mstrategy &= ~STRAT_WAITMASK;
+
     if (mtmp->mtame && mtmp->meating) {
 	if (!canspotmon(mtmp))
 	    map_invisible(mtmp->mx, mtmp->my);