fix: add missing ocaml includes for flow-parser-bin

[lxe]

flow-parser-bin requires opam and ocaml static libs to be installed, from what I gather. Maybe it requires a dynamic lib instead, but I was unable to find it for osx. Suggestions welcome!

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[nmote]

I think @mroch is the most familiar with this

[mroch]

nice, thanks. how did you run into this? wondering why it built for me and on circle without these changes.

[vicapow]

@mroch we just built it on os x. Not sure if I'm talking nonsense but maybe it's setup for you on your workstations automatically as an available dynamically linked lib?