gpac can be moved to Fedora

Hi! It looks like gpac can be moved to Fedora now. The only optional dependency enabled by default in the current package is faad2, but AAC decoding works fine via FFmpeg (ffdec:libfdk_aac or ffdec:aac with libavcodec-freeworld). In fact, FFmpeg decoder is used by default even if gpac is built with faad2 support enabled. I'd like this to happen soon, so if Nicolas doesn't want to or doesn't have time to submit the review request within the next few days, I'll happily do it. Bugzilla ticket for reference: https://bugzilla.rpmfusion.org/show_bug.cgi?id=6890 -- Fedora https://fedoraproject.org Deep in the human unconscious is a pervasive need for a logical universe that makes sense. But the real universe is always one step beyond logic. -- from "The Sayings of Muad'Dib" by the Princess Irulan