gnu: rust-term-0.5: Don't hide package.

* gnu/packages/crates-io.scm (rust-term-0.5):[arguments] Skip build.
Add rust-byteorder-1.3, rust-dirs-1.0, rust-winapi-0.3 to cargo-inputs.
[properties] Remove field.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>