gnu: Add rust-cargo-platform-0.1.

* gnu/packages/crates-io.scm (rust-cargo-platform-0.1): New variable.

gnu/packages/crates-io.scm

@@ -6762,6 +6762,29 @@ (define-public rust-cargo-metadata-0.6
        (;("rust-docopt" ,rust-docopt-0.8)
         ("rust-clap" ,rust-clap-2))))))
 
+(define-public rust-cargo-platform-0.1
+  (package
+    (name "rust-cargo-platform")
+    (version "0.1.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "cargo-platform" version))
+       (file-name
+        (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1mzi60pf0z83qkzqp7jwd61xnqz2b5ydsj7rnnikbgyicd5989h2"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-serde" ,rust-serde-1))))
+    (home-page "https://github.com/rust-lang/cargo")
+    (synopsis "Target platform abstraction for Cargo")
+    (description "This package provides abstractions for the target platforms
+supported by Cargo.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-cargon-0.0
   (package
     (name "rust-cargon")