pkgs/tools/networking/nbd: enable build on all NixOS platforms

The nbd client needs kernel support and is available only on Linux, but
the server process ought to work in all POSIX'ish environments.

svn path=/nixpkgs/trunk/; revision=22936

pkgs/tools/networking/nbd/default.nix

@@ -22,6 +22,6 @@ stdenv.mkDerivation rec {
     description = "map arbitrary files as block devices over the network";
     license = "GPLv2";
     maintainers = [ stdenv.lib.maintainers.simons  ];
-    platforms = stdenv.lib.platforms.gnu;
+    platforms = stdenv.lib.platforms.all;
   };
 }