locate: fix build pre 4.05
locate: fix build pre 4.05

dra27/merlin,dra27/merlin,dra27/merlin,the-lambda-church/merlin,ocaml/merlin,ocaml/merlin,the-lambda-church/merlin,rgrinberg/merlin,ocaml/merlin,rgrinberg/merlin,rgrinberg/merlin,ocaml/merlin,rgrinberg/merlin,dra27/merlin,the-lambda-church/merlin