bug#57159: rust-gmp-mpfr-sys bundles gmp, mpc and mpfr

[Attila Lendvai]

> unless some new rust packages were added that depend on rust-gmp-mpfr-sys, 
> there's probably no dependant of it, and in that case it can be safely 
> removed.

i can't deal with this, lacking time and rust knowledge.

i suggest the removal of this package.

$ ./pre-inst-env guix refresh --list-dependent rust-gmp-mpfr-sys
No dependents other than itself: rust-gmp-mpfr-sys@1.4.7

apologies for the inconvenience,

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• attila lendvai
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