Silence two icc warnings:

/home/melanson/fate/source/ffserver.c(4349):
warning #188: enumerated type mixed with another type
                          audio_enc.codec_id = audio_id;
                                             ^

/home/melanson/fate/source/ffserver.c(4354):
warning #188: enumerated type mixed with another type
                          video_enc.codec_id = video_id;
                                             ^

Originally committed as revision 16397 to svn://svn.ffmpeg.org/ffmpeg/trunk