Don't stop and reset playing audio if we've hit what we think is the end and want to loop,

but it's a tracker format (.mod, .xm), rather than a stream - this fixes the case where
only half the song would play. (Fixes #989)

src/raudio.c

@@ -1482,7 +1482,18 @@ void UpdateMusicStream(Music music)
     // Reset audio stream for looping
     if (streamEnding)
     {	
-        StopMusicStream(music);        // Stop music (and reset)
+		// is this a tracker format or a streamed one (ogg, wav, etc.)	
+		if (!((music.ctxType == MUSIC_MODULE_XM) || (music.ctxType == MUSIC_MODULE_MOD)))
+		{
+			// streamed - stop the music and reset it.
+			StopMusicStream(music);
+		}
+		else
+		{
+			// tracker - don't reset it, but remember that we have hit 
+			// the loop point and are playing normally again.
+			streamEnding = false;
+		}
 
         // Decrease loopCount to stop when required
         if (music.loopCount > 1)