Drop Vorbis as planned feature

It's not as good as Opus. MP3 was added because it's popular, and Flac
provides a good lossless codec.
Vorbis can be added at a later date.

Signed-off-by: Mahyar Koshkouei <deltabeard@users.noreply.github.com>

source/playback.c

@@ -234,7 +234,7 @@ int getFileType(const char *file)
 			else
 			{
 				file_type = FILE_TYPE_OGG;
-				printf("\nFile type is OGG.");
+				printf("\nUnsupported audio in OGG container.");
 			}
 
 			break;