flatpak: Build without canberra
Make Cheese an optional dependency
libcanberra-gtk got removed in the latest Flatpak runtime (3.38), so we
can't build cheese as it hard depends on it. Luckily, we don't
hard-depend on cheese, so let's get rid of it (for now).
As an extra, this commit also makes Cheese an optional dependency,
making it a bit easier to build it at the first go (without installing
cheese-devel) and a shorter CI time.
flatpak: Build EDS without canberra support
canberra-gtk got dropped out of the flatpak 3.38 runtime, so this is
making our CI fail. We don't really need it anyway, so let's drop it.
Edited by Niels De Graef