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/graphics/facedetect/default.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv, fetchFromGitHub, fetchpatch, python3Packages }:
+
+stdenv.mkDerivation rec {
+  pname = "facedetect";
+  version = "0.1";
+
+  src = fetchFromGitHub {
+    owner = "wavexx";
+    repo = "facedetect";
+    rev = "v${version}";
+    sha256 = "0mddh71cjbsngpvjli406ndi2x613y39ydgb8bi4z1jp063865sd";
+  };
+
+  patches = [
+    (fetchpatch {
+      name = "python3-support.patch";
+      url = "https://gitlab.com/wavexx/facedetect/-/commit/8037d4406eb76dd5c106819f72c3562f8b255b5b.patch";
+      sha256 = "1752k37pbkigiwglx99ba9360ahzzrrb65a8d77k3xs4c3bcmk2p";
+    })
+  ];
+
+  buildInputs = [ python3Packages.python python3Packages.wrapPython ];
+  pythonPath = [ python3Packages.numpy python3Packages.opencv4 ];
+
+  dontConfigure = true;
+
+  postPatch = ''
+    substituteInPlace facedetect \
+      --replace /usr/share/opencv "${python3Packages.opencv4}/share/opencv4"
+  '';
+
+  installPhase = ''
+    install -v -m644 -D README.rst $out/share/doc/${pname}-${version}/README.rst
+    install -v -m755 -D facedetect $out/bin/facedetect
+    wrapPythonPrograms
+  '';
+
+  meta = with lib; {
+    homepage = "https://www.thregr.org/~wavexx/software/facedetect/";
+    description = "A simple face detector for batch processing";
+    license = licenses.gpl2Plus;
+    platforms = platforms.all;
+    maintainers = [ maintainers.rycee ];
+  };
+}