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Emulate texture query levels on gles

Gert Wollny requested to merge gerddie/virglrenderer:emu-texture-query-levels-on-gles into master

No GLES equivalent for ARB_texture_query_levels exists, but this is needed for supporting OpenGL 4.3, so emulate it by using a uniform that holds the level information.

This fixes crashes with piglits that that require this extension.

The MR builds on and supersets !419 (closed)

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