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/programs/liboping.nix

@@ -0,0 +1,24 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.liboping;
+in {
+  options.programs.liboping = {
+    enable = mkEnableOption "liboping";
+  };
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ liboping ];
+    security.wrappers = mkMerge (map (
+      exec: {
+        "${exec}" = {
+          owner = "root";
+          group = "root";
+          capabilities = "cap_net_raw+p";
+          source = "${pkgs.liboping}/bin/${exec}";
+        };
+      }
+    ) [ "oping" "noping" ]);
+  };
+}