Added a callback option instead of using a thread to read the GC adapter.

Source/Core/Core/ConfigManager.h

@@ -108,6 +108,7 @@ struct SConfig : NonCopyable
 	// Input settings
 	bool m_BackgroundInput;
 	bool m_GameCubeAdapter;
+	bool m_GameCubeAdapterThread;
 
 	SysConf* m_SYSCONF;