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/dune-site/default.nix

@@ -0,0 +1,23 @@
+{ lib, buildDunePackage, dune_3, dune-private-libs }:
+
+buildDunePackage rec {
+  pname = "dune-site";
+  inherit (dune_3) src version;
+
+  duneVersion = "3";
+
+  dontAddPrefix = true;
+
+  propagatedBuildInputs = [ dune-private-libs ];
+
+  preBuild = ''
+    rm -r vendor/csexp
+  '';
+
+  meta = with lib; {
+    description = "A library for embedding location information inside executable and libraries";
+    inherit (dune_3.meta) homepage;
+    maintainers = with lib.maintainers; [ ];
+    license = licenses.mit;
+  };
+}