gnu: Add rust-ar@0.9.0.

* gnu/packages/crates-io.scm (rust-ar-0.9): New variable.

Change-Id: I8ebdddb56cc67f4ea9bcefabe005b36c93a46688

gnu/packages/crates-io.scm

@@ -11870,6 +11870,27 @@ archive to be linked into Rustcode.")
     (license (list license:asl2.0
                    license:expat))))
 
+(define-public rust-ar-0.9
+  (package
+    (name "rust-ar")
+    (version "0.9.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "ar" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0sdvvrf4inrkmrh6lzwg4z8x38b3gncbb8yqrgayqcd9d1yzfynn"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t))
+    (home-page "https://github.com/mdsteele/rust-ar")
+    (synopsis "Library for encoding/decoding Unix archive files.")
+    (description
+     "This package provides a library for encoding/decoding Unix archive
+files.")
+    (license license:expat)))
+
 (define-public rust-cdshealpix-0.7
   (package
     (name "rust-cdshealpix")