Add long names to AVCodec declarations.

patch by Stefano Sabatini, stefano.sabatini-lala poste it

Originally committed as revision 13009 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/libtheoraenc.c

@@ -277,4 +277,5 @@ AVCodec libtheora_encoder =
     .close = encode_close,
     .encode = encode_frame,
     .pix_fmts = supported_pixel_formats,
+    .long_name = "libtheora Theora",
 };