Prevent loops with del_on_death var for simple mobs

Same principle as the fix for DROPDEL

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -301,6 +301,9 @@
 	if(del_on_death)
 		ghostize()
 		stat = DEAD
+		//Prevent infinite loops if the mob Destroy() is overriden in such
+		//a manner as to cause a call to death() again
+		del_on_death = FALSE
 		qdel(src)
 	else
 		health = 0