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/services/networking/corerad.nix

@@ -0,0 +1,82 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.corerad;
+  settingsFormat = pkgs.formats.toml {};
+
+in {
+  meta.maintainers = with maintainers; [ mdlayher ];
+
+  options.services.corerad = {
+    enable = mkEnableOption "CoreRAD IPv6 NDP RA daemon";
+
+    settings = mkOption {
+      type = settingsFormat.type;
+      example = literalExpression ''
+        {
+          interfaces = [
+            # eth0 is an upstream interface monitoring for IPv6 router advertisements.
+            {
+              name = "eth0";
+              monitor = true;
+            }
+            # eth1 is a downstream interface advertising IPv6 prefixes for SLAAC.
+            {
+              name = "eth1";
+              advertise = true;
+              prefix = [{ prefix = "::/64"; }];
+            }
+          ];
+          # Optionally enable Prometheus metrics.
+          debug = {
+            address = "localhost:9430";
+            prometheus = true;
+          };
+        }
+      '';
+      description = ''
+        Configuration for CoreRAD, see <link xlink:href="https://github.com/mdlayher/corerad/blob/main/internal/config/reference.toml"/>
+        for supported values. Ignored if configFile is set.
+      '';
+    };
+
+    configFile = mkOption {
+      type = types.path;
+      example = literalExpression ''"''${pkgs.corerad}/etc/corerad/corerad.toml"'';
+      description = "Path to CoreRAD TOML configuration file.";
+    };
+
+    package = mkOption {
+      default = pkgs.corerad;
+      defaultText = literalExpression "pkgs.corerad";
+      type = types.package;
+      description = "CoreRAD package to use.";
+    };
+  };
+
+  config = mkIf cfg.enable {
+    # Prefer the config file over settings if both are set.
+    services.corerad.configFile = mkDefault (settingsFormat.generate "corerad.toml" cfg.settings);
+
+    systemd.services.corerad = {
+      description = "CoreRAD IPv6 NDP RA daemon";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        LimitNPROC = 512;
+        LimitNOFILE = 1048576;
+        CapabilityBoundingSet = "CAP_NET_ADMIN CAP_NET_RAW";
+        AmbientCapabilities = "CAP_NET_ADMIN CAP_NET_RAW";
+        NoNewPrivileges = true;
+        DynamicUser = true;
+        Type = "notify";
+        NotifyAccess = "main";
+        ExecStart = "${getBin cfg.package}/bin/corerad -c=${cfg.configFile}";
+        Restart = "on-failure";
+        RestartKillSignal = "SIGHUP";
+      };
+    };
+  };
+}