The glClear call updates draw state in the same way as other draw calls
with _mesa_update_state func
If currently used shader uses textures, _mesa_update_state will try to
update the shader texture state
But if the texture not set yet, before glClear call, it will detect
incompleted texture and will create dummy texture with default values
(see the update_single_program_texture func).
And this will be complete waste of time for glClear
Closes: #7128
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18459>
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