buildRustPackage: disable auditing if it's broken

See also: ad3a5326580 ("rust/cargo.nix: disable audit if audit.meta.broken")

Fixes cross eval of clippy.

pkgs/build-support/rust/build-rust-package/default.nix

···
 , buildFeatures ? [ ]
 , checkFeatures ? buildFeatures
 , useNextest ? false
-, auditable ? true
+, auditable ? !cargo-auditable.meta.broken
 
 , depsExtraArgs ? {}