[Cin] old libavconv with David's patches for IGS (BD menu)

I was building this revision https://github.com/libav/libav/tree/d6251368772a170987387bdc508433c8fcf54cda on arm/termux it required --disable-asm but othervise worked. I applied 4 patches I fished out of mailbox archive with plain cat | patch - p1 patches attached. procedure seems to be documented in patches themselves: === These changes add support for copying overlay streams. So to extract IGS menu from m2ts file: $ avconv -i source.m2ts -vn -an -sn output.mnu To mux IGS menu with h264 video in ts: $ avconv -i video.264 -i test.mnu -f mpegts out.ts Still todo: update mpegts muxer to set correct PID so output may be compatible to BDAV format. Signed-off-by: David Girault <david at dhgirault.fr> ====