[m-rev.] for post-commit review: move get_environment_var_map/3 to the io module

[Zoltan Somogyi]

On Tue, 24 Aug 2021 02:42:07 +1000 (AEST), Julien Fischer <jfischer at opturion.com> wrote: 
> Move get_environment_var_map/3 to the io module.

That's fine.

Zoltan.