Remove low_sample_count_workaround

No longer needed now that hardware clamping methods are corrected.

src/RageSoundManager.cpp

@@ -57,12 +57,6 @@ RageSoundManager::~RageSoundManager()
 	m_mapPreloadedSounds.clear();
 }
 
-
-void RageSoundManager::low_sample_count_workaround()
-{
-	m_pDriver->low_sample_count_workaround();
-}
-
 /*
  * Previously, we went to some lengths to shut down sounds before exiting threads.
  * The only other thread that actually starts sounds is SOUND.  Doing this was ugly;