treewide: purge maintainers.urkud

It's sad, but he's been inactive for the last five years.
Keeping such people in meta.maintainers is counter-productive.

pkgs/development/libraries/grantlee/5.x.nix

@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
       and the design of Django is reused in Grantlee.'';
 
     homepage = http://gitorious.org/grantlee;
-    maintainers = [ stdenv.lib.maintainers.urkud ];
+    maintainers = [ ];
     inherit (qtbase.meta) platforms;
   };
 }

pkgs/development/libraries/grantlee/default.nix

@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
       and the design of Django is reused in Grantlee.'';
 
     homepage = http://gitorious.org/grantlee;
-    maintainers = [ stdenv.lib.maintainers.urkud ];
+    maintainers = [ ];
     inherit (qt4.meta) platforms;
   };
 }