Preserve PATH when invoking Merlin
Preserve PATH when invoking Merlin

Causes some preprocessor problems - for example, with cpp.

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