vorbis encoder missed rename to libvorbis

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@9091 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/oggvorbis.c

@@ -207,8 +207,8 @@ static int oggvorbis_encode_close(AVCodecContext *avccontext) {
 }
 
 
-AVCodec oggvorbis_encoder = {
-    "vorbis",
+AVCodec libvorbis_encoder = {
+    "libvorbis",
     CODEC_TYPE_AUDIO,
     CODEC_ID_VORBIS,
     sizeof(OggVorbisContext),