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/ocaml-modules/xml-light/default.nix

@@ -0,0 +1,42 @@
+{ stdenv, lib, fetchFromGitHub, ocaml, findlib }:
+
+stdenv.mkDerivation rec {
+  pname = "ocaml${ocaml.version}-xml-light";
+  version = "2.4";
+
+  src = fetchFromGitHub {
+    owner = "ncannasse";
+    repo = "xml-light";
+    rev = version;
+    sha256 = "sha256-2txmkl/ZN5RGaLQJmr+orqwB4CbFk2RpLJd4gr7kPiE=";
+  };
+
+  nativeBuildInputs = [ ocaml findlib ];
+
+  strictDeps = true;
+
+  createFindlibDestdir = true;
+
+  installPhase = ''
+    runHook preInstall
+    make install_ocamlfind
+    mkdir -p $out/share
+    cp -vai doc $out/share/
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "Minimal Xml parser and printer for OCaml";
+    longDescription = ''
+      Xml-Light provides functions to parse an XML document into an OCaml
+      data structure, work with it, and print it back to an XML
+      document. It support also DTD parsing and checking, and is
+      entirely written in OCaml, hence it does not require additional C
+      library.
+    '';
+    homepage = "http://tech.motion-twin.com/xmllight.html";
+    license = lib.licenses.lgpl21;
+    maintainers = [ lib.maintainers.romildo ];
+    inherit (ocaml.meta) platforms;
+  };
+}