Fix using `odoc_driver` to build `odoc`
Quoting the docs of the Findlib library:
> * Furthermore, the environment variables OCAMLPATH, OCAMLFIND_DESTDIR,
> * OCAMLFIND_COMMANDS, OCAMLFIND_IGNORE_DUPS_IN, and CAMLLIB are interpreted.
> * By default, the function takes
> * the values found in the environment, but you can pass different values
> * using the [env_*] arguments. By setting these values to empty strings
> * they are no longer considered.
So when we do
```
dune exec -- odoc_driver -p odoc
```
findlib finds the `odoc` library in `_build/install` in some part of the
codebase, in `<opam switch>/lib/odoc` in some other parts of the code, which
results in the docs for `odoc` not being built.
This changes to consistently find the `<opam switch>/lib/odoc`.
619093
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Oct 04 13:01 +00:00