gnu: Add rust-rtoolbox-0.0.1.

* gnu/packages/crates-io.scm (rust-rtoolbox-0.0.1): New variable.

gnu/packages/crates-io.scm

@@ -16422,6 +16422,31 @@ number ``crunching``.")
      "@code{roxmltree} represents an XML 1.0 document as a read-only tree.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-rtoolbox-0.0.1
+  (package
+    (name "rust-rtoolbox")
+    (version "0.0.1")
+    (source (origin
+              (method url-fetch)
+              (uri (crate-uri "rtoolbox" version))
+              (file-name (string-append name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0jjjngwn1fa39kschc8zb4hynp4b0jdind7z225cph7m2k2j4kh3"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-libc" ,rust-libc-0.2)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-serde-json" ,rust-serde-json-1)
+        ("rust-winapi" ,rust-winapi-0.3))))
+    (home-page "")
+    (synopsis "Utility functions for other crates")
+    (description
+     "This package provides utility functions for other crates with no
+backwards compatibility guarantees.")
+    (license license:asl2.0)))
+
 (define-public rust-rt-format-0.3
   (package
     (name "rust-rt-format")