mesa: Use _mesa_has_OES_geometry_shader() when validating draws

mesa: Use _mesa_has_OES_geometry_shader() when validating draws

In validate_DrawElements_common() we need to check for OES_geometry_shader
extension to determine if we should fail if transform feedback is
unpaused. However current code reads ctx->Extensions.OES_geometry_shader
directly, which does not take context version into account. This means
that if the context is GLES 3.0, which makes the OES_geometry_shader
inapplicable, we would not validate the draw properly. To fix it, let's
replace the check with a call to _mesa_has_OES_geometry_shader().

Fixes following dEQP tests on i965 with a GLES 3.0 context:

dEQP-GLES3.functional.negative_api.vertex_array#draw_elements
dEQP-GLES3.functional.negative_api.vertex_array#draw_elements_incomplete_primitive
dEQP-GLES3.functional.negative_api.vertex_array#draw_elements_instanced
dEQP-GLES3.functional.negative_api.vertex_array#draw_elements_instanced_incomplete_primitive
dEQP-GLES3.functional.negative_api.vertex_array#draw_range_elements
dEQP-GLES3.functional.negative_api.vertex_array#draw_range_elements_incomplete_primitive

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com>