117b3e0763
It is currently not possible to build Squeekboard with only packages that are available in Debian. This is not likely to change until Squeekboard has been ported to GTK4 or gtk4-layer-shell. Until then, vendor the dependencies during the build, so that one can still use the ".deb"-packages for testing. Part-of: <https://gitlab.gnome.org/World/Phosh/squeekboard/-/merge_requests/659>