[m-rev.] for review: avoid make overrides in tests/invalid

[Peter Wang]

On Tue, 12 Oct 2021 07:52:30 +1100 "Zoltan Somogyi" <zoltan.somogyi at runbox.com> wrote:
> For review by anyone.
> 
> After addressing review comments, I intend to do the same
> for the other test directories that have test-case-specific actions.
> 
> Zoltan.

> Don't override make rules in tests/invalid.
> 
That looks fine.

Peter