knights and covetous monsters

Implement Pat's suggestion of setting the mavenge flag when a covetous
monster flees, since they may subsequently teleport back and attack even
if mflee is set.

doc/fixes34.1

@@ -144,6 +144,7 @@ player polymorphed as rust monster would lose gold in inventory by
 	attempting to eat it, even though the eat failed
 no messages were printed when dowaterdemon or dowaternymph failed to create
 	a monster doe to the G_GONE check
+knights should be able to avenge attacks from covetous monsters
 
 
 Platform- and/or Interface-Specific Fixes

src/wizard.c

@@ -305,6 +305,7 @@ tactics(mtmp)
 	    case STRAT_HEAL:	/* hide and recover */
 		/* if wounded, hole up on or near the stairs (to block them) */
 		/* unless, of course, there are no stairs (e.g. endlevel) */
+		mtmp->mavenge = 1; /* covetous monsters attack while fleeing */
 		if (In_W_tower(mtmp->mx, mtmp->my, &u.uz) ||
 			(mtmp->iswiz && !xupstair && !mon_has_amulet(mtmp))) {
 		    if (!rn2(3 + mtmp->mhp/10)) rloc(mtmp);