problem with mesa-7.6-0.15+

[Petrus de Calguarium]

KDE compositing (desktop effects) was working spledidly 
until today's updates of mesa/glx. After updating, it was 
no longer possible to log into KDE with desktop effects 
enabled (gnome login remains possible, but compix is 
untested).

As a result, I culled the latest mesa-7.6-0.16 from koji, 
but the problem remains: no KDE login with desktop 
effects enabled.