[Piglit] [PATCH] Add GL_SELECT render mode test

[Pierre-Eric Pelloux-Prayer]

Hi,
Here's a patch adding a simple test for GL_SELECT render mode.
It tries to represent the typical use case of selection by rendering a
bunch of squares, and then verifying  the select buffer content.
It also verifies that alpha, depth, or stencil tests have no effect on
selection results.

Regards,
Pierre-Eric
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