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/text/kdiff3/default.nix

@@ -0,0 +1,39 @@
+{ mkDerivation
+, lib
+, fetchurl
+, extra-cmake-modules
+, kdoctools
+, wrapGAppsHook
+, boost
+, kcrash
+, kconfig
+, kinit
+, kparts
+, kiconthemes
+}:
+
+mkDerivation rec {
+  pname = "kdiff3";
+  version = "1.9.5";
+
+  src = fetchurl {
+    url = "https://download.kde.org/stable/${pname}/${pname}-${version}.tar.xz";
+    sha256 = "sha256-CDchWW2dQ3O8LxKYOUqN21tVp61NckKTOnzYrmRoPBo=";
+  };
+
+  buildInputs = [ boost ];
+
+  nativeBuildInputs = [ extra-cmake-modules kdoctools wrapGAppsHook ];
+
+  propagatedBuildInputs = [ kconfig kcrash kinit kparts kiconthemes ];
+
+  cmakeFlags = [ "-Wno-dev" ];
+
+  meta = with lib; {
+    description = "Compares and merges 2 or 3 files or directories";
+    homepage = "https://invent.kde.org/sdk/kdiff3";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ peterhoeg ];
+    platforms = with platforms; linux;
+  };
+}