fix build(bcs func CheckForAnAudioFileOnCD not used anymore)

src/audio/DMAudio.cpp

@@ -171,7 +171,7 @@ cDMAudio::SetDynamicAcousticModelingStatus(uint8 status)
 bool
 cDMAudio::CheckForAnAudioFileOnCD(void)
 {
-	return AudioManager.CheckForAnAudioFileOnCD();
+	return 0; //exists only in android version, and used only in symbols
 }
 
 char