bug#74234: [PATCHv2 rust-team 20/20] gnu: Add gnome-authenticator.

[Efraim Flashner]

Finally pushed to the rust-team branch!

I moved this package to gnome.scm since it fits there much better, and I
rewrote parts of it to use bits from the meson-build-system.

There were also a number of crates which had the wrong cargo-inputs
which I had to fix.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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