rust-team branch merged

[Efraim Flashner]

I've merged the rust-team branch into master. I've dropped rust for
aarch64-linux again for now until I can get it built on cuirass so it's
not holding up the branch any longer.

Unfortunately I forgot about the mesa update earlier so there's more
rebuilds than I expected.

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