Our workaround for getting meson and cargo working together
included a separate 'release' target that replaced
'ninja dist' so that we could vendor dependencies.
Now we use meson's add_dist_script to vendor the
dependencies as part of 'ninja dist', so we no longer need
the 'release' target.
Allows us to get rid of build.rs, which was only used to
compile resources. static_resource.rs is now created by
meson, and the meson path is used for include_bytes!.
Closes https://gitlab.gnome.org/World/podcasts/issues/55
Previously we were using the env! macro to determine
build-time variables like version, app ID, and locale dir.
Instead of relying on env vars, we can create a configuration
file with meson and import it.
Christopher Davis