Bug#740421: libavformat54: merge HTTP parser from ffmpeg

[Alessandro Ghedini]

Control: tags 739936 patch
Control: tags 740421 patch

As reported in #740421 libav's HTTP audio streaming is really slow on startup,
and as reported in #739936 it doesn't support ICY metadata. So I decided to see
if I could merge ffmpeg's HTTP thingy in libav... and it turns out that it was
actually rather easy.

Basically I copied libavformat/http.c from ffmpeg to libav, and fixed a bunch
of compile issues. The patch also includes the addtion of av_asprintf() and
av_strtok() since they are needed to build.

Again, I don't know what's libav policy for merging stuff from ffmpeg, but this
patch brings a pretty big improvement to libav's audio streaming support.

(also worth noting is that I only tested this patch with libav's package from
experimental).

Cheers

-- 
perl -E '$_=q;$/= @{[@_]};and s;\S+;<inidehG ordnasselA>;eg;say~~reverse'
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