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/phash/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchFromGitHub, pkg-config, cimg, imagemagick }:
+
+stdenv.mkDerivation rec {
+  pname = "pHash";
+  version = "0.9.6";
+
+  buildInputs = [ cimg ];
+
+  # CImg.h calls to external binary `convert` from the `imagemagick` package
+  # at runtime
+  propagatedBuildInputs = [ imagemagick ];
+
+  nativeBuildInputs = [ pkg-config ];
+
+  configureFlags = ["--enable-video-hash=no" "--enable-audio-hash=no"];
+  postInstall = ''
+    cp ${cimg}/include/CImg.h $out/include/
+  '';
+
+  src = fetchFromGitHub {
+    owner = "clearscene";
+    repo = "pHash";
+    rev = version;
+    sha256 = "sha256-frISiZ89ei7XfI5F2nJJehfQZsk0Mlb4n91q/AiZ2vA=";
+  };
+
+  meta = with lib; {
+    description = "Compute the perceptual hash of an image";
+    license = licenses.gpl3;
+    maintainers = [maintainers.imalsogreg];
+    platforms = platforms.all;
+    homepage = "http://www.phash.org";
+    downloadPage = "https://github.com/clearscene/pHash";
+  };
+}