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/powerdns.nix

@@ -0,0 +1,47 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.powerdns;
+  configDir = pkgs.writeTextDir "pdns.conf" "${cfg.extraConfig}";
+in {
+  options = {
+    services.powerdns = {
+      enable = mkEnableOption "PowerDNS domain name server";
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "launch=bind";
+        description = ''
+          PowerDNS configuration. Refer to
+          <link xlink:href="https://doc.powerdns.com/authoritative/settings.html"/>
+          for details on supported values.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    systemd.packages = [ pkgs.pdns ];
+
+    systemd.services.pdns = {
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network.target" "mysql.service" "postgresql.service" "openldap.service" ];
+
+      serviceConfig = {
+        ExecStart = [ "" "${pkgs.pdns}/bin/pdns_server --config-dir=${configDir} --guardian=no --daemon=no --disable-syslog --log-timestamp=no --write-pid=no" ];
+      };
+    };
+
+    users.users.pdns = {
+      isSystemUser = true;
+      group = "pdns";
+      description = "PowerDNS";
+    };
+
+    users.groups.pdns = {};
+
+  };
+}