uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

nixos/modules/config/gnu.nix

@@ -0,0 +1,44 @@
+{ config, lib, pkgs, ... }:
+
+{
+  options = {
+    gnu = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = ''
+        When enabled, GNU software is chosen by default whenever a there is
+        a choice between GNU and non-GNU software (e.g., GNU lsh
+        vs. OpenSSH).
+      '';
+    };
+  };
+
+  config = lib.mkIf config.gnu {
+
+    environment.systemPackages = with pkgs;
+      # TODO: Adjust `requiredPackages' from `system-path.nix'.
+      # TODO: Add Inetutils once it has the new `ifconfig'.
+      [ parted
+        #fdisk  # XXX: GNU fdisk currently fails to build and it's redundant
+                # with the `parted' command.
+        nano zile
+        texinfo # for the stand-alone Info reader
+      ]
+      ++ lib.optional (!stdenv.isAarch32) grub2;
+
+
+    # GNU GRUB, where available.
+    boot.loader.grub.enable = !pkgs.stdenv.isAarch32;
+    boot.loader.grub.version = 2;
+
+    # GNU lsh.
+    services.openssh.enable = false;
+    services.lshd.enable = true;
+    programs.ssh.startAgent = false;
+    services.xserver.startGnuPGAgent = true;
+
+    # TODO: GNU dico.
+    # TODO: GNU Inetutils' inetd.
+    # TODO: GNU Pies.
+  };
+}