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/r53-ddns.nix

@@ -0,0 +1,72 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.r53-ddns;
+  pkg = pkgs.r53-ddns;
+in
+{
+  options = {
+    services.r53-ddns = {
+
+      enable = mkEnableOption "r53-ddyns";
+
+      interval = mkOption {
+        type = types.str;
+        default = "15min";
+        description = "How often to update the entry";
+      };
+
+      zoneID = mkOption {
+        type = types.str;
+        description = "The ID of your zone in Route53";
+      };
+
+      domain = mkOption {
+        type = types.str;
+        description = "The name of your domain in Route53";
+      };
+
+      hostname = mkOption {
+        type = types.str;
+        description = ''
+          Manually specify the hostname. Otherwise the tool will try to use the name
+          returned by the OS (Call to gethostname)
+        '';
+      };
+
+      environmentFile = mkOption {
+        type = types.str;
+        description = ''
+          File containing the AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY
+          in the format of an EnvironmentFile as described by systemd.exec(5)
+        '';
+      };
+
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    systemd.timers.r53-ddns = {
+      description = "r53-ddns timer";
+      wantedBy = [ "timers.target" ];
+      timerConfig = {
+        OnBootSec = cfg.interval;
+        OnUnitActiveSec = cfg.interval;
+      };
+    };
+
+    systemd.services.r53-ddns = {
+      description = "r53-ddns service";
+      serviceConfig = {
+        ExecStart = "${pkg}/bin/r53-ddns -zone-id ${cfg.zoneID} -domain ${cfg.domain}"
+          + lib.optionalString (cfg.hostname != null) " -hostname ${cfg.hostname}";
+        EnvironmentFile = "${cfg.environmentFile}";
+        DynamicUser = true;
+      };
+    };
+
+  };
+}