This is unused. If you're not using OpenGL, don't compile LowLevelWindow at all.

stepmania/src/arch/LowLevelWindow/LowLevelWindow_Null.h

@@ -1,22 +0,0 @@
-#ifndef LOW_LEVEL_WINDOW_NULL_H
-#define LOW_LEVEL_WINDOW_NULL_H
-
-#include "LowLevelWindow.h"
-
-class LowLevelWindow_Null: public LowLevelWindow
-{
-	RageDisplay::VideoModeParams CurrentParams;
-public:
-	LowLevelWindow_Null() {};
-	~LowLevelWindow_Null() {};
-	void *GetProcAddress(CString s) { return NULL; };
-	bool TryVideoMode( RageDisplay::VideoModeParams p, bool &bNewDeviceOut ) { return false; };
-	void SwapBuffers() {};
-	void Update(float fDeltaTime) {};
-
-	RageDisplay::VideoModeParams GetVideoModeParams() const { return CurrentParams; }
-};
-#undef ARCH_LOW_LEVEL_WINDOW
-#define ARCH_LOW_LEVEL_WINDOW LowLevelWindow_Null
-
-#endif