flvdec: disable hack that attempts to parse aac bitstream in the flv demuxer.

I was unable to find a file that needs this hack, if you have one please
contact us!
Fixes out of array accesses.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/flvdec.c

@@ -822,7 +822,7 @@ retry_duration:
             }
             if ((ret = flv_get_extradata(s, st, size)) < 0)
                 return ret;
-            if (st->codec->codec_id == AV_CODEC_ID_AAC) {
+            if (st->codec->codec_id == AV_CODEC_ID_AAC && 0) {
                 MPEG4AudioConfig cfg;
                 if (avpriv_mpeg4audio_get_config(&cfg, st->codec->extradata,
                                              st->codec->extradata_size * 8, 1) >= 0) {