add missing header

stepmania/src/MenuTimer.cpp

@@ -18,6 +18,7 @@
 #include "AnnouncerManager.h"
 #include "ThemeManager.h"
 #include "Font.h"
+#include "RageSoundManager.h"
 
 const float TIMER_SECONDS = 99;
 

stepmania/src/Screen.cpp

@@ -17,6 +17,7 @@
 #include "RageSound.h"
 #include "ThemeManager.h"
 #include "ScreenManager.h"
+#include "RageSoundManager.h"
 
 Screen::Screen( CString sName )
 {

stepmania/src/ScreenEdit.cpp

@@ -19,6 +19,7 @@
 #include "GameManager.h"
 #include "GameConstantsAndTypes.h"
 #include "RageLog.h"
+#include "RageSoundManager.h"
 #include "GameState.h"
 #include "InputMapper.h"
 #include "RageLog.h"