babd1d526b
GLSL 4.60 offically added this but games and older CTS suites actually had shaders that did this, we may as well enable it everywhere. Adding stable because it appears apps in the wild do this. Acked-by: Timothy Arceri <tarceri@itsqueeze.com> Reviewed-by: Matt Turner <mattst88@gmail.com> Cc: <mesa-stable@lists.freedesktop.org>