[Mesa-dev] glthread prep series

[Eric Anholt]

Here's a small series of fixes that have accumulated in the glthread-5
branch, located in my tree as "glthread-push".  Patch 1 replaces the "LOL
HAX" commit of glthread-5, which I'll be rebasing out as my next step
there.

The glapi attribute additions aren't strictly fixes, but I think it's good to
have them regardless of whether the glthread stuff ends up panning out -- this
is surely not the only use of the API XML for logging arguments that we can
imagine.

Mostly, though, I want a chance to shorten what's becoming a rather long
branch.