[patch v1] malloc: add tst-mxfast to hugetlb exclusion list

[DJ Delorie]

Wilco Dijkstra <Wilco.Dijkstra@arm.com> writes:
>> tst-mxfast needs GLIBC_TUNABLES to be set to its own value.
>
> LGTM.
>
> Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>

Thanks!
Pushed.