[m-rev.] for review: Add test case for Mantis bug #489.

[Julien Fischer]

On Tue, 14 Jan 2020, Peter Wang wrote:

> tests/mmc_make/Mmakefile:
> tests/mmc_make/bug489.exp:
> tests/mmc_make/bug489.m:
> tests/mmc_make/bug489.other.m:
> tests/mmc_make/lexer.m:
>    Add test where a separate sub-module is stored in a source file
>    with a name that could be confused for a standard library module.

That's fine.

Julien.