Bug#981285: Please move fdk-aac to main

[Jeremy Bicha <jeremy.bicha@canonical.com>]

> > [1]https://www.gnu.org/licenses/license-list.html#fdk

> This clearly states that the FDK license is incompatible with the GPL.

> For pipewire that should be okay, because it is Expat, if nothing makes
> the whole thing LGPL.  For gstreamer and pulseaudio it's pretty much not
> okay, because they are some form of GPL.

Fedora's official position is that their copy of fdk-aac to be GPL compatible.
https://lists.fedoraproject.org/archives/list/legal@lists.fedoraproject.org/thread/OVW25JRWOKOLVMW3XGUX7E4OXFUR2RCG/

Fedora's fdk-aac copy does not include newer AAC features which might
be patent-encumbered.
https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/thread/F64JBJI2IZFT2A5QDXGHNMPALCQIVJAX/

fdk-aac is of interest to me because gnome-remote-desktop 43 will
depend on it for audio forwarding to remote clients.
gnome-remote-desktop is in main and so we want fdk-aac to be in main
too so that all of gnome-remote-desktop's features work as expected.

Thank you,
Jeremy Bicha