Native bindings to the ARB_texture_rgb10_a2ui extension.

This extension adds support for a new texturing format for unsigned 10.10.10.2 integer textures.

OpenGL has supported RGB10 and RGB10_A2 formats for a very long time. This extension provides a variant of RGB10_A2 which supports unsigned integer data (in contrast to the above "unsigned normalized integer" formats).

Requires OpenGL 3.0 or EXT_texture_integer. Promoted to core in OpenGL 3.3.