use SDL_Delay to sleep

stepmania/src/StepMania.cpp

@@ -29,8 +29,7 @@
 #include "arch/ErrorDialog/ErrorDialog.h"
 #include "time.h"
 
-#include "SDL.h"
-#include "SDL_syswm.h"		// for SDL_SysWMinfo
+#include "SDL_utils.h"
 
 //
 // StepMania global classes
@@ -591,8 +590,8 @@ static void GameLoop()
 		DISPLAY->Flip();
 
 		if(g_bHasFocus)
-			::Sleep( 0 );	// give some time to other processes and threads
+			SDL_Delay( 0 );	// give some time to other processes and threads
 		else
-			::Sleep( 2 );	// give more time to other processes and threads, but not so much that we skip sound
+			SDL_Delay( 2 );	// give more time to other processes and threads, but not so much that we skip sound
 	}
 }