correct a header

stepmania/src/Player.cpp

@@ -11,7 +11,7 @@
 */
 
 #include "GameConstantsAndTypes.h"
-#include "Math.h" // for fabs()
+#include <math.h> // for fabs()
 #include "Player.h"
 #include "RageUtil.h"
 #include "PrefsManager.h"

stepmania/src/RageThreads.h

@@ -1,7 +1,7 @@
 #ifndef RAGE_THREADS_H
 #define RAGE_THREADS_H
 
-#include "SDL_Thread.h"
+#include "SDL_thread.h"
 
 /* Mutex class that follows the behavior of Windows mutexes: if the same
  * thread locks the same mutex twice, we just increase a refcount; a mutex