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/mail/mail.nix

@@ -0,0 +1,34 @@
+{ config, options, lib, ... }:
+
+with lib;
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.mail = {
+
+      sendmailSetuidWrapper = mkOption {
+        type = types.nullOr options.security.wrappers.type.nestedTypes.elemType;
+        default = null;
+        internal = true;
+        description = ''
+          Configuration for the sendmail setuid wapper.
+        '';
+      };
+
+    };
+
+  };
+
+  ###### implementation
+
+  config = mkIf (config.services.mail.sendmailSetuidWrapper != null) {
+
+    security.wrappers.sendmail = config.services.mail.sendmailSetuidWrapper;
+
+  };
+
+}