* gnu/packages/crates-io.scm (rust-tuikit-0.4): Update to 0.4.6.
[arguments]: Don't skip the build. Add a phase to fix the test suite.
[cargo-inputs]: Replace rust-nix-0.14 with 0.24, rust-term-0.6 with 0.7.
Change-Id: Ic981ea589dd73f20cc3849d28797403c607c28cb