gnu: Add rust-eui48-0.4.

* gnu/packages/crates-graphics.scm (rust-eui48-0.4): New variable.
(rust-eui48-0.3): Inherit from rust-eui48-0.4.

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

gnu/packages/crates-graphics.scm

@@ -628,8 +628,37 @@ and iOS.")
     (description "Geometry primitives written in Rust.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-eui48-0.4
+  (package
+    (name "rust-eui48")
+    (version "0.4.6")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "eui48" version))
+        (file-name
+         (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32 "0sqbmcnvilanzjagknmpf85pnji2b9hn2pqzd5rygrfkwikghk4c"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-regex" ,rust-regex-1)
+        ("rust-rustc-serialize" ,rust-rustc-serialize-0.3)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-serde-json" ,rust-serde-json-1))
+       #:cargo-development-inputs
+       (("rust-bincode" ,rust-bincode-1))))
+    (home-page "https://github.com/abaumhauer/eui48")
+    (synopsis "Library to generate and parse IEEE EUI-48 and EUI-64")
+    (description
+     "This package provides a library to generate and parse IEEE EUI-48 and
+EUI-64, also known as MAC-48 media access control addresses.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-eui48-0.3
   (package
+    (inherit rust-eui48-0.4)
     (name "rust-eui48")
     (version "0.3.2")
     (source
@@ -639,18 +668,11 @@ and iOS.")
        (file-name (string-append name "-" version ".tar.gz"))
        (sha256
         (base32 "0mmdhczfdxwv5v5h90ydqkx0mdqiv0h2clshm2cm4qlwp0gacw29"))))
-    (build-system cargo-build-system)
     (arguments
      `(#:skip-build? #t
        #:cargo-inputs
        (("rust-rustc-serialize" ,rust-rustc-serialize-0.3)
-        ("rust-serde" ,rust-serde-1))))
-    (home-page "https://github.com/abaumhauer/eui48")
-    (synopsis "Library to generate and parse IEEE EUI-48 and EUI-64")
-    (description
-     "This package provides a library to generate and parse IEEE EUI-48 and
-EUI-64, also known as MAC-48 media access control addresses.")
-    (license (list license:expat license:asl2.0))))
+        ("rust-serde" ,rust-serde-1))))))
 
 (define-public rust-gfx-0.18
   (package