fix call to `ocaml install.ml` in Makefile
fix call to `ocaml install.ml` in Makefile

janestreet/re2,jhuapl-saralab/re2,jhuapl-saralab/re2,skunkwerks/re2,janestreet/re2,jhuapl-saralab/re2,janestreet/re2,janestreet/re2,skunkwerks/re2,skunkwerks/re2,skunkwerks/re2,jhuapl-saralab/re2,jhuapl-saralab/re2,janestreet/re2,skunkwerks/re2,janestreet/re2,skunkwerks/re2,jhuapl-saralab/re2