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/misc/xflux/default.nix

@@ -0,0 +1,40 @@
+{lib, stdenv, fetchurl, libXxf86vm, libXext, libX11, libXrandr, gcc}:
+stdenv.mkDerivation {
+  pname = "xflux";
+  version = "unstable-2013-09-01";
+  src = fetchurl {
+    url = "https://justgetflux.com/linux/xflux64.tgz";
+    sha256 = "cc50158fabaeee58c331f006cc1c08fd2940a126e99d37b76c8e878ef20c2021";
+  };
+
+  libPath = lib.makeLibraryPath [
+    gcc.cc
+    libXxf86vm
+    libXext
+    libX11
+    libXrandr
+  ];
+
+  unpackPhase = ''
+    unpackFile $src;
+  '';
+  installPhase = ''
+    mkdir -p "$out/bin"
+    cp  xflux "$out/bin"
+  '';
+  postFixup = ''
+    patchelf --set-interpreter $(cat $NIX_CC/nix-support/dynamic-linker) --set-rpath "$libPath" "$out/bin/xflux"
+  '';
+  meta = {
+    description = "Adjusts your screen to emit warmer light at night";
+    longDescription = ''
+      xflux changes the color temperature of your screen to be much warmer
+      when the sun sets, and then changes it back its colder temperature
+      when the sun rises.
+    '';
+    homepage = "https://justgetflux.com/";
+    license = lib.licenses.unfree;
+    platforms = lib.platforms.linux;
+    maintainers = [ lib.maintainers.paholg ];
+  };
+}