bug#52181: [core-update-frozen] many rust package can't build because them source file-name use ".crate" suffix.

[Maxime Devos]

Hi,

> 
> ;; XXX: modify tarball? on the next world-rebuild
> (define tarball?/fixed
>   (let ((tarball?/old tarball?))
>     (lambda (filename)
>       (or (tarball? filename)

This should be tarball?/old, not tarball?.

Greetings,
Maxime.