revert commit e3b29f0: failed compile in Ubuntu due to the difference in header file between FFMPEG and libavutil-dev
revert commit e3b29f0: failed compile in Ubuntu due to the difference in header file between FFMPEG and libavutil-dev

vladimir-kazakov/gpac,porcelijn/gpac,emmanouil/gpac,RodolpheFouquet/gpac,rbouqueau/gpac_brew_travis,porcelijn/gpac,emmanouil/gpac,RodolpheFouquet/gpac,rbouqueau/gpac,rbouqueau/gpac,rbouqueau/gpac,nguyen-viet-thanh-trung/gpac,porcelijn/gpac,vladimir-kazakov/gpac,Bevara/Access-open,ARSekkat/gpac,porcelijn/gpac,rauf/gpac,porcelijn/gpac,gpac/gpac,vladimir-kazakov/gpac,gpac/gpac,vladimir-kazakov/gpac,Bevara/Access-open,rbouqueau/gpac,rauf/gpac,rbouqueau/gpac,aymanelyaagoubi/gpac,emmanouil/gpac,ARSekkat/gpac,nguyen-viet-thanh-trung/gpac,rbouqueau/gpac,rbouqueau/gpac,rauf/gpac,aymanelyaagoubi/gpac,rbouqueau/gpac_brew_travis,aymanelyaagoubi/gpac,aymanelyaagoubi/gpac,rauf/gpac,nguyen-viet-thanh-trung/gpac,aymanelyaagoubi/gpac,porcelijn/gpac,ARSekkat/gpac,vladimir-kazakov/gpac,aymanelyaagoubi/gpac,gpac/gpac,rbouqueau/gpac_brew_travis,Bevara/Access-open,ARSekkat/gpac,RodolpheFouquet/gpac,Bevara/Access-open,gpac/gpac,RodolpheFouquet/gpac,nguyen-viet-thanh-trung/gpac,rbouqueau/gpac_brew_travis,rauf/gpac,Bevara/Access-open,gpac/gpac,emmanouil/gpac,gpac/gpac,emmanouil/gpac,Bevara/Access-open,RodolpheFouquet/gpac,ARSekkat/gpac,gpac/gpac,nguyen-viet-thanh-trung/gpac,RodolpheFouquet/gpac,rbouqueau/gpac,rbouqueau/gpac_brew_travis,rauf/gpac,vladimir-kazakov/gpac,nguyen-viet-thanh-trung/gpac,ARSekkat/gpac,gpac/gpac,rbouqueau/gpac_brew_travis,emmanouil/gpac