Transform feedback: Add tests of integral output types.
When GLSL version 1.30 is supported, transform feedback can output integral types (uint, int, uvec, and ivec). This patch expands the existing EXT_transform_feedback/output-type tests to validate those integral types. Verified on the closed-source nVidia Linux driver and on Mesa master using Intel Sandy Bridge. Reviewed-by: Eric Anholt <firstname.lastname@example.org>
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