elf: sort tunables list from ld.so

[Florian Weimer]

* DJ Delorie:

> Florian Weimer <fweimer@redhat.com> writes:
>> Can we sort during generation of dl-tunable_list.h?
>> It would fix bug 30027, too.
>
> It would also create an ongoing "we changed tunables id" situation, as
> every new tunable would renumber other tunables.
>
> But if awk is already doing that, sorting is at least predictable ;-)

It's only doing that on hash resizing.

The other problem we have is that there is currently no way to signal a
missing tunable.

Thanks,
Florian