gnugo: disable format hardening

pkgs/games/gnugo/default.nix

@@ -1,25 +1,20 @@
 { stdenv, fetchurl }:
 
-let
-
-    versionNumber = "3.8";
-
-in
-
-stdenv.mkDerivation {
-
-  name = "gnugo-${versionNumber}";
+stdenv.mkDerivation rec {
+  name = "gnugo-${version}";
+  version = "3.8";
 
   src = fetchurl {
-    url = "mirror://gnu/gnugo/gnugo-${versionNumber}.tar.gz";
+    url = "mirror://gnu/gnugo/gnugo-${version}.tar.gz";
     sha256 = "0wkahvqpzq6lzl5r49a4sd4p52frdmphnqsfdv7gdp24bykdfs6s";
   };
 
+  hardeningDisable = [ "format" ];
+
   meta = {
     description = "GNU Go - A computer go player";
     homepage = "http://http://www.gnu.org/software/gnugo/";
     license = stdenv.lib.licenses.gpl3;
     platforms = stdenv.lib.platforms.unix;
   };
-
 }