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/mtr.nix

@@ -0,0 +1,41 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.programs.mtr;
+
+in {
+  options = {
+    programs.mtr = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to add mtr to the global environment and configure a
+          setcap wrapper for it.
+        '';
+      };
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.mtr;
+        defaultText = literalExpression "pkgs.mtr";
+        description = ''
+          The package to use.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.systemPackages = with pkgs; [ cfg.package ];
+
+    security.wrappers.mtr-packet = {
+      owner = "root";
+      group = "root";
+      capabilities = "cap_net_raw+p";
+      source = "${cfg.package}/bin/mtr-packet";
+    };
+  };
+}