st/mesa: require RGBA2, RGB4, and RGBA4 to be renderable
If the driver does not support rendering to these formats but does support texturing, we can end up in incompatibilities between textures and renderbuffers that are then copied to. Fixes KHR-GL45.copy_image.functional on nvc0 Reviewed-by:Ilia Mirkin <imirkin@alum.mit.edu> Reviewed-by:
Marek Olšák <marek.olsak@amd.com> Cc: 19.0 <mesa-stable@lists.freedesktop.org> (cherry picked from commit cbd1ad61)
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