prebuffer small sounds to reduce buffering threads. This differs

from preloading; this loads the file directly, before decompression,
so it can load much longer sounds, which avoids any disk access
so no buffering thread is needed.

stepmania/src/RageSoundReader_Chain.cpp

@@ -76,7 +76,8 @@ int RageSoundReader_Chain::LoadSound( RString sPath )
 	}
 
 	RString sError;
-	RageSoundReader *pReader = RageSoundReader_FileReader::OpenFile( sPath, sError );
+	bool bPrebuffer;
+	RageSoundReader *pReader = RageSoundReader_FileReader::OpenFile( sPath, sError, &bPrebuffer );
 	if( pReader == NULL )
 	{
 		LOG->Warn( "RageSoundReader_Chain: error opening sound \"%s\": %s",