[PATCH v2] Remove union wait

[Roland McGrath]

> Given that we have not done done a build cycle in a distribution I think the
> most conservative step is a staged removal. I think your original instinct is
> the best way forward e.g. removal in 2.25.

Do you have a precise definition of "staged removal" in mind?

My first guess at what this means is that now (for 2.24) we add
__attribute_deprecated__ to the 'union wait' type definition, and then
shortly after 2.24 branches we remove it entirely.  I'm not sure about
documentation changes.


Thanks,
Roland