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/development/libraries/dlib/default.nix

@@ -0,0 +1,40 @@
+{ stdenv, lib, fetchFromGitHub, cmake, pkg-config, libpng, libjpeg
+, guiSupport ? false, libX11
+
+  # see http://dlib.net/compile.html
+, sse4Support ? stdenv.hostPlatform.sse4_1Support
+, avxSupport ? stdenv.hostPlatform.avxSupport
+, cudaSupport ? true
+}:
+
+stdenv.mkDerivation rec {
+  pname = "dlib";
+  version = "19.24";
+
+  src = fetchFromGitHub {
+    owner = "davisking";
+    repo = "dlib";
+    rev ="v${version}";
+    sha256 = "sha256-YhIjP9TIIyQF6lBj85gyVRIAAwgIodzh0ViQL8v2ACA=";
+  };
+
+  postPatch = ''
+    rm -rf dlib/external
+  '';
+
+  cmakeFlags = [
+    "-DUSE_DLIB_USE_CUDA=${if cudaSupport then "1" else "0"}"
+    "-DUSE_SSE4_INSTRUCTIONS=${if sse4Support then "yes" else "no"}"
+    "-DUSE_AVX_INSTRUCTIONS=${if avxSupport then "yes" else "no"}" ];
+
+  nativeBuildInputs = [ cmake pkg-config ];
+  buildInputs = [ libpng libjpeg ] ++ lib.optional guiSupport libX11;
+
+  meta = with lib; {
+    description = "A general purpose cross-platform C++ machine learning library";
+    homepage = "http://www.dlib.net";
+    license = licenses.boost;
+    maintainers = with maintainers; [ christopherpoole ma27 ];
+    platforms = platforms.linux;
+  };
+}