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>

pkgs/tools/security/mokutil/default.nix

@@ -0,0 +1,40 @@
+{ stdenv
+, lib
+, fetchFromGitHub
+, autoreconfHook
+, pkg-config
+, openssl
+, efivar
+, keyutils
+}:
+
+stdenv.mkDerivation rec {
+  pname = "mokutil";
+  version = "0.5.0";
+
+  src = fetchFromGitHub {
+    owner = "lcp";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-dt41TCr6RkmE9H+NN8LWv3ogGsK38JtLjVN/b2mbGJs=";
+  };
+
+  nativeBuildInputs = [
+    autoreconfHook
+    pkg-config
+  ];
+
+  buildInputs = [
+    openssl
+    efivar
+    keyutils
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/lcp/mokutil";
+    description = "Utility to manipulate machines owner keys";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ nickcao ];
+    platforms = platforms.linux;
+  };
+}