gnu: rust-value-bag-1: Update to 1.4.2.
* gnu/packages/crates-io.scm (rust-value-bag-1): Update to 1.4.2.
[arguments]: Don't skip build.
[cargo-inputs]: Add rust-value-bag-serde1-1, rust-value-bag-sval2-1.
Remove rust-ctor-0.1, rust-erased-serde-0.3, rust-serde-1,
rust-serde-fmt-1, rust-sval-1, rust-version-check-0.9.
[cargo-development-inputs]: Add rust-wasm-bindgen-0.2,
rust-wasm-bindgen-test-0.3.
Change-Id: I1184493dd14f535a801492218a14e2f6af7fb0c8