Antioxidant (new rust build system) update - 100% builds

[Maxime Devos <maximedevos@telenet.be>]

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Hi,

100% (rounded up) of the packages build with antioxidant, though a very 
few still fail to build: <https://ci.guix.gnu.org/eval/749079/dashboard>.

So far, work on antioxidant has been done in a separate channel for 
convenience, but given that almost everything builds now, I think it's a 
good time to start looking into moving it into Guix proper (initially as 
a branch, as there are some remaining TODOs like e.g. 'why are some of 
the binaries made with antioxidant larger than with cargo-build-system + 
fix that').

More concretely, this would mean changing the 'runtime' transformations 
done by 'antioxidant-packages.scm' (in the style of '(guix)Defining 
Package Variants') to source code transformations ("guix style").

IIRC, Ludo' has some "guix style" patches for moving #:cargo-inputs to 
'inputs' and such; those could perhaps be used as a basis.

Greetings,
Maxime.

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