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/erm_xml/default.nix

@@ -0,0 +1,31 @@
+{ stdenv, lib, fetchFromGitHub, ocaml, findlib, ocamlbuild }:
+
+if lib.versionOlder ocaml.version "4.02"
+then throw "erm_xml is not available for OCaml ${ocaml.version}"
+else
+
+stdenv.mkDerivation rec {
+  pname = "ocaml${ocaml.version}-erm_xml";
+  version = "0.3+20180112";
+
+  src = fetchFromGitHub {
+    owner = "hannesm";
+    repo = "xml";
+    rev = "bbabdade807d8281fc48806da054b70dfe482479";
+    sha256 = "sha256-OQdLTq9tJZc6XlcuPv2gxzYiQAUGd6AiBzfSi169XL0=";
+  };
+
+  nativeBuildInputs = [ ocaml findlib ocamlbuild ];
+
+  strictDeps = true;
+
+  createFindlibDestdir = true;
+
+  meta = {
+    homepage = "https://github.com/hannesm/xml";
+    description = "XML Parser for discrete data";
+    platforms = ocaml.meta.platforms or [ ];
+    license = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ vbgl ];
+  };
+}