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/x11/display-managers/lightdm-greeters/tiny.nix

@@ -0,0 +1,92 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  dmcfg = config.services.xserver.displayManager;
+  ldmcfg = dmcfg.lightdm;
+  cfg = ldmcfg.greeters.tiny;
+
+in
+{
+  options = {
+
+    services.xserver.displayManager.lightdm.greeters.tiny = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable lightdm-tiny-greeter as the lightdm greeter.
+
+          Note that this greeter starts only the default X session.
+          You can configure the default X session using
+          <xref linkend="opt-services.xserver.displayManager.defaultSession"/>.
+        '';
+      };
+
+      label = {
+        user = mkOption {
+          type = types.str;
+          default = "Username";
+          description = ''
+            The string to represent the user_text label.
+          '';
+        };
+
+        pass = mkOption {
+          type = types.str;
+          default = "Password";
+          description = ''
+            The string to represent the pass_text label.
+          '';
+        };
+      };
+
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = ''
+          Section to describe style and ui.
+        '';
+      };
+
+    };
+
+  };
+
+  config = mkIf (ldmcfg.enable && cfg.enable) {
+
+    services.xserver.displayManager.lightdm.greeters.gtk.enable = false;
+
+    nixpkgs.config.lightdm-tiny-greeter.conf =
+    let
+      configHeader = ''
+        #include <gtk/gtk.h>
+        static const char *user_text = "${cfg.label.user}";
+        static const char *pass_text = "${cfg.label.pass}";
+        static const char *session = "${dmcfg.defaultSession}";
+      '';
+    in
+      optionalString (cfg.extraConfig != "")
+        (configHeader + cfg.extraConfig);
+
+    services.xserver.displayManager.lightdm.greeter =
+      mkDefault {
+        package = pkgs.lightdm-tiny-greeter.xgreeters;
+        name = "lightdm-tiny-greeter";
+      };
+
+    assertions = [
+      {
+        assertion = dmcfg.defaultSession != null;
+        message = ''
+          Please set: services.xserver.displayManager.defaultSession
+        '';
+      }
+    ];
+
+  };
+}