Add more death drops to leather golems

In addition to the leather armor, leather golems can now drop
leather cloaks and saddles.

doc/fixes3-7-0.txt

@@ -838,6 +838,7 @@ if a lit potion of oil on the floor was launched by an explosion and it hit
 	tried to extinguish it as a light source
 place_object() validated coordinates after using them to index level.objects
 killed rope golem may drop leashes, bullwhips, and grappling hooks
+killed leather golem may drop leather cloaks, and saddles
 using magic portals stuns hero for a few turns
 using level teleporters confuses hero without teleport control for a few turns
 clear obj->bypass for buried objects [a giant on ice triggers a fire trap,

src/mon.c

@@ -676,7 +676,9 @@ make_corpse(struct monst *mtmp, unsigned int corpseflags)
     case PM_LEATHER_GOLEM:
         num = d(2, 4);
         while (num--)
-            obj = mksobj_at(LEATHER_ARMOR, x, y, TRUE, FALSE);
+            obj = mksobj_at(rn2(4) ? LEATHER_ARMOR
+                            : rn2(3) ? LEATHER_CLOAK : SADDLE,
+                            x, y, TRUE, FALSE);
         free_mgivenname(mtmp);
         break;
     case PM_GOLD_GOLEM: