[m-rev.] for post-commit review: remove remaining references to Erlang in compiler

[Julien Fischer]

On Thu, 29 Oct 2020, Zoltan Somogyi wrote:

> After this, the only remaining hits for "egrep [eE]rlang *.m" in the compiler
> are intentionally left options in options.m, and historical comments. For review
> by anyone.

That's fine.

Julien.