Fix for PRs 36043, 58744 and 65408

[Mike Stump]

On Mar 14, 2015, at 10:56 AM, Jakub Jelinek <jakub@redhat.com> wrote:
>> newlib doesn’t have mmap.  Indeed, some machines will never have mmap.  newlib has sbrk.
> 
> Still, I think it is preferrable to test with mmap…

I don’t see anything wrong with going the target mmap direction…  my post was just to provide information…  not decide which is better.  I’d rather leave the issue to those with an opinion.