[bug#38106] [PATCH] gnu: mrustc: Update to 0.8.1.

[Danny Milosavljevic]

> I have an account on bayfront but cannot compile guix there (from manual 
> checkout).  I get:
> 
> error: failed to load 'guix/scripts/pack.scm':
> ice-9/eval.scm:293:34: no binding `zip' to hide in module (gnu packages 
> compression)
> 
> even after removing all .go files and removing ~/.cache/guile .

(That was because gnu/packages/rust.scm had a misplaced parenthesis.  It did
provide an error message for the parenthesis and then continued to load a lot
of files until it finally failed with the error message above.  I did not see
the first error message at first)

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