Restore OCaml 4.00.1 compat in Cohttp_lwt by removing use of `|>`
Restore OCaml 4.00.1 compat in Cohttp_lwt by removing use of `|>`

mor1/ocaml-cohttp,inhabitedtype/ocaml-cohttp,inhabitedtype/ocaml-cohttp,mor1/ocaml-cohttp,inhabitedtype/ocaml-cohttp,edwintorok/ocaml-cohttp,dsheets/ocaml-cohttp,fdopen/ocaml-cohttp,fdopen/ocaml-cohttp,marklrh/ocaml-cohttp,dsheets/ocaml-cohttp,mor1/ocaml-cohttp,dsheets/ocaml-cohttp,Drup/ocaml-cohttp,fdopen/ocaml-cohttp,Drup/ocaml-cohttp,edwintorok/ocaml-cohttp,Drup/ocaml-cohttp,marklrh/ocaml-cohttp,edwintorok/ocaml-cohttp,marklrh/ocaml-cohttp