[PATCH] dynarray: Implement begin/end functions in the spirit of C++

[Florian Weimer]

On 06/13/2017 08:54 PM, Adhemerval Zanella wrote:
> I think there is already a non const DYNARRAY_PREFIX##at defined.

Right, I was confused.  I'm committing this without this comment change
and its mention in the ChangeLog.

Thanks,
Florian