[m-rev.] for review: delete references to Erlang in the compiler

[Peter Wang]

On Wed, 28 Oct 2020 16:53:00 +1100 "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> 
> 2020-10-28 14:24 GMT+11:00 "Zoltan Somogyi" <zoltan.somogyi at runbox.com>:
> > 2020-10-28 14:01 GMT+11:00 "Julien Fischer" <jfischer at opturion.com>:
> >> At the moment mercury-json maintains compatibilty with Mercury 20.06 and
> >> it's certainly possible for 20.06 installations have the erlang grade
> >> installed.
> > 
> > OK, in that case, I will make --libgrade-exclude generate only an informational
> > (non-warn/error) when given "erlang".
> 
> The attached diff does this, together with the additions discussed in earlier
> emails. The updated log message is attached as well. Unless someone objects,
> I intend to commit the updated diff tomorrow around lunchtime.

Something broke with the type representation change.
You can reproduce it by installing Mercury then trying to build a
program with either mmake or mmc --make.

Peter