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/ntp/openntpd.nix

@@ -0,0 +1,85 @@
+{ pkgs, lib, config, options, ... }:
+
+with lib;
+
+let
+  cfg = config.services.openntpd;
+
+  package = pkgs.openntpd_nixos;
+
+  configFile = ''
+    ${concatStringsSep "\n" (map (s: "server ${s}") cfg.servers)}
+    ${cfg.extraConfig}
+  '';
+
+  pidFile = "/run/openntpd.pid";
+
+in
+{
+  ###### interface
+
+  options.services.openntpd = {
+    enable = mkEnableOption "OpenNTP time synchronization server";
+
+    servers = mkOption {
+      default = config.services.ntp.servers;
+      defaultText = literalExpression "config.services.ntp.servers";
+      type = types.listOf types.str;
+      inherit (options.services.ntp.servers) description;
+    };
+
+    extraConfig = mkOption {
+      type = with types; lines;
+      default = "";
+      example = ''
+        listen on 127.0.0.1
+        listen on ::1
+      '';
+      description = ''
+        Additional text appended to <filename>openntpd.conf</filename>.
+      '';
+    };
+
+    extraOptions = mkOption {
+      type = with types; separatedString " ";
+      default = "";
+      example = "-s";
+      description = ''
+        Extra options used when launching openntpd.
+      '';
+    };
+  };
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+    meta.maintainers = with lib.maintainers; [ thoughtpolice ];
+    services.timesyncd.enable = mkForce false;
+
+    # Add ntpctl to the environment for status checking
+    environment.systemPackages = [ package ];
+
+    environment.etc."ntpd.conf".text = configFile;
+
+    users.users.ntp = {
+      isSystemUser = true;
+      group = "ntp";
+      description = "OpenNTP daemon user";
+      home = "/var/empty";
+    };
+    users.groups.ntp = {};
+
+    systemd.services.openntpd = {
+      description = "OpenNTP Server";
+      wantedBy = [ "multi-user.target" ];
+      wants = [ "network-online.target" "time-sync.target" ];
+      before = [ "time-sync.target" ];
+      after = [ "dnsmasq.service" "bind.service" "network-online.target" ];
+      serviceConfig = {
+        ExecStart = "${package}/sbin/ntpd -p ${pidFile} ${cfg.extraOptions}";
+        Type = "forking";
+        PIDFile = pidFile;
+      };
+    };
+  };
+}