Bug#1041382: gegl: ff-load/ff-save crash with ffmpeg 6.0

Actually I think it's better to just disable the unused feature completely and then we can close this bug. Thank you, Jeremy Bicha

Bug#1041382: gegl: ff-load/ff-save crash with ffmpeg 6.0

Control: severity -1 important Control: retitle -1 gegl: ff-load/ff-save crash with ffmpeg 6.0 Control: forwarded -1 https://gitlab.gnome.org/GNOME/gegl/-/issues/324 Upstream says gegl's ff-load and ff-save functions aren't used yet and they don't have an immediate fix for the crash. So I'm going