Remove unused function musicclass::initefchannels()

It's a function that does nothing, used by no one.

desktop_version/src/Music.cpp

@@ -460,11 +460,6 @@ void musicclass::changemusicarea(int x, int y)
 	}
 }
 
-void musicclass::initefchannels()
-{
-	// for (var i:int = 0; i < 16; i++) efchannel.push(new SoundChannel);
-}
-
 void musicclass::playef(int t, int offset)
 {
 	// efchannel[currentefchan] = efchan[t].play(offset);