[PATCH v2] Remove union wait

[Florian Weimer]

On 04/12/2016 08:01 PM, Roland McGrath wrote:
> I don't dispute those notions as likely realities in many situations.
> I just dispute the notion that they are universal absolutes that mean
> the middle way is clearly useless to everyone and can be disregarded
> out of hand.

Absolutely true in general.  Based on available data, I just don't think 
staged deprecation is the best approach for dealing with union wait.

Another oddity: Portable software already has a check for the 
availability of union wait.  A deprecated union wait type will still 
pass the configure test, and cause deprecation warnings (possibly 
treated as errors) later in the build.  Direct removal does not.

Florian