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/camlpdf/default.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, which, ocaml, findlib }:
+
+if lib.versionOlder ocaml.version "4.10"
+then throw "camlpdf is not available for OCaml ${ocaml.version}"
+else
+
+stdenv.mkDerivation rec {
+  version = "2.5";
+  pname = "ocaml${ocaml.version}-camlpdf";
+
+  src = fetchFromGitHub {
+    owner = "johnwhitington";
+    repo = "camlpdf";
+    rev = "v${version}";
+    sha256 = "sha256:1qmsa0xgi960y7r20mvf8hxiiml7l1908s4dm7nq262f19w51gsl";
+  };
+
+  nativeBuildInputs = [ which ocaml findlib ];
+
+  strictDeps = true;
+
+  preInstall = ''
+    mkdir -p $out/lib/ocaml/${ocaml.version}/site-lib/stublibs
+  '';
+
+  meta = with lib; {
+    description = "An OCaml library for reading, writing and modifying PDF files";
+    homepage = "https://github.com/johnwhitington/camlpdf";
+    license = licenses.lgpl21Plus;
+    maintainers = with maintainers; [vbgl];
+  };
+}