4.09 & 4.10 support

[copy]

Currently:

% make
make -C src all
make[1]: Entering directory '/tmp/gen_js_api.1.0.5/src'
ocamlc -w +A-4-41-45 -warn-error +8 -c ojs.mli ojs.ml
ocamlc -w +A-4-41-45 -warn-error +8 -c ojs_exn.mli ojs_exn.ml
ocamlc -w +A-4-41-45 -warn-error +8 -a -o gen_js_api.cma ojs.cmo ojs_exn.cmo
ocamlc -w +A-4-41-45 -warn-error +8 -I +compiler-libs -o gen_js_api ocamlcommon.cma gen_js_api.mli gen_js_api.ml
File "gen_js_api.ml", line 156, characters 76-79:
156 |       | Error (loc, err) -> Some (Location.error_of_printer loc print_error err)
                                                                                  ^^^
Error: The function applied to this argument has type
         ?loc:Location.t -> ?sub:Location.msg list -> Location.report
This argument cannot be applied without label

[mlasson]

This issue has been handled by PR #101 !