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/security/pam_usb.nix

@@ -0,0 +1,52 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.security.pam.usb;
+
+  anyUsbAuth = any (attrByPath ["usbAuth"] false) (attrValues config.security.pam.services);
+
+in
+
+{
+  options = {
+
+    security.pam.usb = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Enable USB login for all login systems that support it.  For
+          more information, visit <link
+          xlink:href="https://github.com/aluzzardi/pam_usb/wiki/Getting-Started#setting-up-devices-and-users" />.
+        '';
+      };
+
+    };
+
+  };
+
+  config = mkIf (cfg.enable || anyUsbAuth) {
+
+    # Make sure pmount and pumount are setuid wrapped.
+    security.wrappers = {
+      pmount =
+        { setuid = true;
+          owner = "root";
+          group = "root";
+          source = "${pkgs.pmount.out}/bin/pmount";
+        };
+      pumount =
+        { setuid = true;
+          owner = "root";
+          group = "root";
+          source = "${pkgs.pmount.out}/bin/pumount";
+        };
+    };
+
+    environment.systemPackages = [ pkgs.pmount ];
+
+  };
+}