gnu: Add rust-seahash-4.

* gnu/packages/crates-io.scm (rust-seahash-4): New variable.

gnu/packages/crates-io.scm

@@ -44521,6 +44521,26 @@ Pwrite traits from the scroll crate.")
 proven statistical guarantees.")
     (license license:expat)))
 
+(define-public rust-seahash-4
+  (package
+    (name "rust-seahash")
+    (version "4.1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "seahash" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "0sxsb64np6bvnppjz5hg4rqpnkczhsl8w8kf2a5lr1c08xppn40w"))))
+    (build-system cargo-build-system)
+    (arguments '(#:skip-build? #t))
+    (home-page "https://gitlab.redox-os.org/redox-os/seahash")
+    (synopsis "Hash function with proven statistical guarantees")
+    (description
+     "This package provides a fast, portable hash function with proven
+statistical guarantees.")
+    (license license:expat)))
+
 (define-public rust-seccomp-sys-0.1
   (package
     (name "rust-seccomp-sys")