Fix incorrect header include

Author: codemercenary

autowiring/ThreadPool.h

@@ -1,8 +1,8 @@
 // Copyright (C) 2012-2015 Leap Motion, Inc. All rights reserved.
 #pragma once
 #include <atomic>
-#include <memory>
 #include <mutex>
+#include MEMORY_HEADER
 
 class DispatchQueue;
 class DispatchThunkBase;