SPIGOT-1915: Fix players seeing their own passengers

nms-patches/EntityTrackerEntry.patch

@@ -12,8 +12,12 @@
  public class EntityTrackerEntry {
  
      private static final Logger c = LogManager.getLogger();
-@@ -79,13 +84,14 @@
+@@ -76,16 +81,17 @@
-             this.broadcast(new PacketPlayOutMount(this.tracker));
+ 
+         if (!list1.equals(this.w)) {
+             this.w = list1;
+-            this.broadcast(new PacketPlayOutMount(this.tracker));
++            this.broadcastIncludingSelf(new PacketPlayOutMount(this.tracker)); // CraftBukkit
          }
  
 -        if (this.tracker instanceof EntityItemFrame && this.a % 10 == 0) {