Use correct spawn reason for Villagers Breeding. Fixes BUKKIT-4113

src/main/java/net/minecraft/server/PathfinderGoalMakeLove.java

@@ -84,7 +84,7 @@ public class PathfinderGoalMakeLove extends PathfinderGoal {
         this.b.setAge(6000);
         entityvillager.setAge(-24000);
         entityvillager.setPositionRotation(this.b.locX, this.b.locY, this.b.locZ, 0.0F, 0.0F);
-        this.d.addEntity(entityvillager);
+        this.d.addEntity(entityvillager, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.BREEDING); // CraftBukkit - added SpawnReason
         this.d.broadcastEntityEffect(entityvillager, (byte) 12);
     }
 }