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/perceptualdiff/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchFromGitHub, cmake, freeimage }:
+
+stdenv.mkDerivation rec {
+  pname = "perceptualdiff";
+  version = "2.1";
+
+  src = fetchFromGitHub {
+    owner = "myint";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "176n518xv0pczf1yyz9r5a8zw5r6sh5ym596kmvw30qznp8n4a8j";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ freeimage ];
+
+  meta = with lib; {
+    description = "A program that compares two images using a perceptually based image metric";
+    homepage = "https://github.com/myint/perceptualdiff";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ uri-canva ];
+    platforms = platforms.unix;
+    broken = stdenv.hostPlatform.system == "aarch64-darwin";
+  };
+}