ocamlPackages.mdx: add missing dependency to result

Changed files
+2
pkgs
development
ocaml-modules
+2
pkgs/development/ocaml-modules/mdx/default.nix
···
camlp-streams,
lwt,
re,
+
result,
csexp,
gitUpdater,
}:
···
ocaml-version
camlp-streams
re
+
result
findlib
];
checkInputs = [