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/zarith/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchFromGitHub
+, ocaml, findlib, pkg-config
+, gmp
+}:
+
+if lib.versionOlder ocaml.version "4.04"
+then throw "zarith is not available for OCaml ${ocaml.version}"
+else
+
+stdenv.mkDerivation rec {
+  pname = "ocaml${ocaml.version}-zarith";
+  version = "1.12";
+  src = fetchFromGitHub {
+    owner = "ocaml";
+    repo = "Zarith";
+    rev = "release-${version}";
+    sha256 = "1jslm1rv1j0ya818yh23wf3bb6hz7qqj9pn5fwl45y9mqyqa01s9";
+  };
+
+  nativeBuildInputs = [ pkg-config ocaml findlib ];
+  propagatedBuildInputs = [ gmp ];
+  strictDeps = true;
+
+  dontAddPrefix = true;
+  dontAddStaticConfigureFlags = true;
+  configurePlatforms = [];
+  configureFlags = [ "-installdir ${placeholder "out"}/lib/ocaml/${ocaml.version}/site-lib" ];
+
+  preInstall = "mkdir -p $out/lib/ocaml/${ocaml.version}/site-lib/stublibs";
+
+  meta = with lib; {
+    description = "Fast, arbitrary precision OCaml integers";
+    homepage    = "http://forge.ocamlcore.org/projects/zarith";
+    license     = licenses.lgpl2;
+    inherit (ocaml.meta) platforms;
+    maintainers = with maintainers; [ thoughtpolice vbgl ];
+  };
+}