forcefighting an undetected monster

Fix the case <Someone> saw, where forcefighting an undetected monster
would still leave it undetected, resulting in an odd message sequence unless
you kept forcefighting on the next turns.  This also left the monster at a
disadvantage, since it wouldn't fight back. Added a check to wakeup() for this
case, cutting off the possibilities and allowing the monster to fight back.

doc/fixes34.1

@@ -198,6 +198,7 @@ in town, watch should not allow trees to be cut down
 cancel chat direction cancels the chat
 prevent "the mimic looks better" on an unrecognized mimic hit with
 	healing spell
+after forcefighting a concealed lurker, the lurker wouldn't fight back
 
 
 Platform- and/or Interface-Specific Fixes

src/mon.c

@@ -2065,6 +2065,10 @@ register struct monst *mtmp;
 	mtmp->meating = 0;	/* assume there's no salvagable food left */
 	setmangry(mtmp);
 	if(mtmp->m_ap_type) seemimic(mtmp);
+	else if (flags.forcefight && !flags.mon_moving && mtmp->mundetected) {
+	    mtmp->mundetected = 0;
+	    newsym(mtmp->mx, mtmp->my);
+	}
 }
 
 /* Wake up nearby monsters. */