[Piglit] [PATCH 0/6] Cleanup and prepare for pre OpenGL 3.0 drivers

[Emil Velikov]

As mentioned by Ilia (iirc) and Brian, when we explicitly request the GL 
version via the config attribs, waffle attempts to use the 
ARB_create_context extension(s).

As those may not be available on drivers lacking OpenGL 3.0 support, be 
more careful when we set the version attrib in the config.

First five patches are related cleanup, with the final one doing the 
actual work.

Note: the series is only compile tested. Hopefully I haven't butchered 
it :-)

-Emil