xorriso: 1.4.4 -> 1.4.6

See http://lists.gnu.org/archive/html/info-gnu/2016-09/msg00010.html
for release announcement

[Bjørn: remove "pkgs." from commit message subject.]

(cherry picked from commit ea1afcd9f468f9f8813dba93d167bf2e558c797a)

pkgs/tools/cd-dvd/xorriso/default.nix

···
 { fetchurl, stdenv, libcdio, zlib, bzip2, readline, acl, attr }:
 
 stdenv.mkDerivation rec {
-  name = "xorriso-1.4.4";
+  name = "xorriso-1.4.6";
 
   src = fetchurl {
     url = "mirror://gnu/xorriso/${name}.tar.gz";
-    sha256 = "1izv8dvwacyh432vv1rm6lyjrq0v205kyakfra6iwa146c9m9fgr";
+    sha256 = "112p0ghwzxrcjbsir1n2jxhq103ckrw93wzvd55qqvzfgs674vsj";
   };
 
   doCheck = true;