gnu: Add emacs-list-utils.

* gnu/packages/emacs.scm (emacs-list-utils): New public variable.

gnu/packages/emacs.scm

@@ -8297,3 +8297,22 @@ arXiv, Google Scholar, Library of Congress, etc.
     (description
      "@code{emacs-helm-gtags} provides a Emacs Helm interface to GNU Global.")
     (license license:gpl3+)))
+
+(define-public emacs-list-utils
+  (package
+    (name "emacs-list-utils")
+    (version "0.4.4")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://github.com/rolandwalker/list-utils/archive/"
+                           "v" version ".tar.gz"))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32
+         "1xc1xh8c82h5gdjbgpdsdclgwxkxbb7h3x3a2bscpm41g8pnan4p"))))
+    (build-system emacs-build-system)
+    (home-page "https://github.com/rolandwalker/list-utils")
+    (synopsis "List-manipulation utility functions")
+    (description "This package provides a list manipulation library for Emacs.")
+    (license license:gpl3+)))