[PATCH v3] a68: return alias set 0 for Algol 68

[Jose E. Marchesi]

Thanks for the patch.
I just installed it on your behalf.

> Hi,
>
> Following review feedback, this version adds the requested commit
> subject prefix and an explanatory comment before the return statement
> in a68_get_alias_set.
>
> The frontend builds successfully and make check-algol68 passes with this
> change.
>
> Thanks,
> Kanishka Solanki