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/cd-dvd/isomd5sum/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchFromGitHub
+, python3
+, popt
+}:
+
+stdenv.mkDerivation rec {
+  pname = "isomd5sum";
+  version = "1.2.3";
+
+  src = fetchFromGitHub {
+    owner = "rhinstaller";
+    repo = pname;
+    rev = version;
+    sha256 = "1wjnh2hlp1hjjm4a8wzdhdrm73jq41lmpmy3ls0rh715p3j7z4q9";
+  };
+
+  strictDeps = true;
+  nativeBuildInputs = [ python3 ];
+  buildInputs = [ popt ] ;
+
+  postPatch = ''
+    substituteInPlace Makefile --replace "#/usr/" "#"
+    substituteInPlace Makefile --replace "/usr/" "/"
+  '';
+
+  dontConfigure = true;
+
+  makeFlags = [ "DESTDIR=${placeholder "out"}" ];
+
+  # we don't install python stuff as it borks up directories
+  installTargets = [ "install-bin" "install-devel" ];
+
+  meta = with lib; {
+    homepage = "https://github.com/rhinstaller/isomd5sum";
+    description = "Utilities for working with md5sum implanted in ISO images";
+    platforms = platforms.linux;
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ knl ];
+  };
+}