const fix

stepmania/src/arch/MovieTexture/MovieTexture_DShow.cpp

@@ -218,7 +218,7 @@ void MovieTexture_DShow::Create()
         RageException::Throw( "Could not run the DirectShow graph." );
 }
 
-void MovieTexture_DShow::NewData(char *data)
+void MovieTexture_DShow::NewData(const char *data)
 {
 	LockMutex L(buffer_mutex);
 	buffer_changed = true;

stepmania/src/arch/MovieTexture/MovieTexture_DShow.h

@@ -60,7 +60,7 @@ public:
 	virtual bool IsPlaying() const;
 	void SetLooping(bool looping=true) { m_bLoop = looping; }
 
-	void NewData(char *buffer);
+	void NewData(const char *buffer);
 
 protected:
 	char *buffer;