[Piglit] RFC: shader_runner & gles2

[Tom Gall]

I had posted this patch back on December 28th to fix shader_runner to
work for gles2.

http://lists.freedesktop.org/archives/piglit/2012-December/004391.html
If there's no feedback or issues, could it be merged please?

Thanks!

--
Regards,
Tom

"Where's the kaboom!? There was supposed to be an earth-shattering
kaboom!" Marvin Martian
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