This drops the script we used to build fractal. And uses know only
meson. This also drops the need for specifying sources since cargo does
that for us.
This also bumps the meson version.
This also drops the build option `skip-cargo-build`.
Most of the changes are comming from https://gitlab.gnome.org/World/pika-backup
Flatpak manifest previously set RUST_BACKTRACE=1 during the build only, not
runtime, using the "env" build option. However, the intention was probably
to set RUST_BACKTRACE=1 at runtime, not during the build.
Julian Sparber
Kévin Commaille
Maximiliano Sandoval R
enterprisey
Veli Tasali
Alejandro Domínguez