[m-rev.] for post-commit review: always compute self-import FIM langs

[Julien Fischer]

On Sat, 14 Aug 2021, Zoltan Somogyi wrote:

> For review by anyone. I am mostly seeking feedback about
> whether parse_tree_module_src should have TWO fields
> for self-import FIM languages: those languages for which
> the current module needs a self-import FIM in the interface
> section, and one likewise for the implementation section.
> My take is: yes, it should.

Agreed.  The diff is fine.

Julien.