list-packages: Add links to Hydra for mips64el-linux.

* build-aux/list-packages.scm (package->sxml): Add 'url' call for
  mips64el-linux.

build-aux/list-packages.scm

@@ -4,7 +4,7 @@
              (cdr (command-line)))'
 !#
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2013 Alex Sassmannshausen <alex.sassmannshausen@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -148,7 +148,8 @@ (define (url system)
 
     `(div "status: "
           ,(url "x86_64-linux") " "
-          ,(url "i686-linux")))
+          ,(url "i686-linux") " "
+          ,(url "mips64el-linux")))
 
   (define (package-logo name)
     (and=> (lookup-gnu-package name)