[PATCH roland/opendir] Refactor opendir.

[Roland McGrath]

> On 13 May 2015 16:35, Roland McGrath wrote:
> > I've refactored the opendir implementation, with a few effects.
> > The main one (and my motivation) is that opendir no longer calls
> > __opendirat, and so opendir uses only open while only __opendirat
> > uses openat.
> 
> why ?  seems like we generally want to move in the other direction, especially 
> as newer kernel ports move to not even include non-at syscall variants.

All the world is Linux and everything we do should be done with Linuxism
tunnel vision, I know.  But I'm just funny that way.