SPIGOT-3302: Armor stands not dropping armor

nms-patches/EntityArmorStand.patch

@@ -114,3 +114,11 @@
                  this.bz.set(i, ItemStack.a);
              }
          }
+@@ -601,6 +630,7 @@
+     }
+ 
+     public void killEntity() {
++        org.bukkit.craftbukkit.event.CraftEventFactory.callEntityDeathEvent(this, drops); // CraftBukkit - call event
+         this.die();
+     }
+