The `control` file is invalid without the newline before `Package:`, and
fails to build.
Generally, libraries shouldn't be listed under `Dependencies`. The -dev
versions should be listed under `Build-Dependencies`, and `shlibs`
automatically adds runtime dependencies based on the linked libraries
with the version of the library that was linked.
`libsystemd` also doesn't exist, the package is `libsystemd0`. But is
that actually needed? Looks like it's pulled in by `libseat1` and not
used directly. `libxcb1` shouldn't be needed, x11rb provides a Rust
implementation, and doesn't support integration with libxcb without the
`allow-unsafe-code` feature, which doesn't seem to be used here.
For things that are opened with `dlopen`, this doesn't apply, though it
would probably be best to avoid that for any hard dependency.
Also adds these packages to `Recommends` of Debian package.
These bindings don't give keyboard focus the created window, which is
awkward. We also want to somehow make the bindings close the window if
open.
