gnu: rust-adler32-1.0: Don't hide package.

* gnu/packages/crates-io.scm (rust-adler32-1.0)[arguments]: Skip build.
Add rust-rand-0.4 to cargo-development-inputs.
[properties]: Remove field.

gnu/packages/crates-io.scm

@@ -42,15 +42,18 @@ (define-public rust-adler32-1.0
         (file-name
           (string-append name "-" version ".crate"))
         (sha256
-          (base32
-            "0p7fxlnks9l7p7rwfqi7aqgnk2bps5zc0rjiw00mdw19nnbjjlky"))))
+         (base32
+          "0p7fxlnks9l7p7rwfqi7aqgnk2bps5zc0rjiw00mdw19nnbjjlky"))))
     (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-development-inputs
+       (("rust-rand" ,rust-rand-0.4))))
     (home-page "https://github.com/remram44/adler32-rs")
     (synopsis "Implementation of the Adler32 rolling hash algorithm")
     (description
      "This library is an implementation of the Adler32 rolling hash algorithm in
 the Rust programming language.")
-    (properties '((hidden? . #t)))
     (license (list license:bsd-3
                    license:zlib))))