remove api that was scheduled for removal

patches/api/0065-LivingEntity-setKiller.patch

@@ -0,0 +1,26 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: BillyGalbreath <Blake.Galbreath@GMail.com>
+Date: Mon, 31 Jul 2017 01:49:43 -0500
+Subject: [PATCH] LivingEntity#setKiller
+
+
+diff --git a/src/main/java/org/bukkit/entity/LivingEntity.java b/src/main/java/org/bukkit/entity/LivingEntity.java
+index 32e89741ffd895e31af0104a0126c2f72742a1bb..f154c5607b1dc3585052d9f02cf8b28cf8a3c886 100644
+--- a/src/main/java/org/bukkit/entity/LivingEntity.java
++++ b/src/main/java/org/bukkit/entity/LivingEntity.java
+@@ -365,6 +365,15 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
+     @Nullable
+     public Player getKiller();
+ 
++    // Paper start
++    /**
++     * Sets the player identified as the killer of the living entity.
++     *
++     * @param killer player
++     */
++    public void setKiller(@Nullable Player killer);
++    // Paper end
++
+     /**
+      * Adds the given {@link PotionEffect} to the living entity.
+      *