mesa: Skip ES 3.0/3.1 transform feedback primitive counting error.

mesa: Skip ES 3.0/3.1 transform feedback primitive counting error.

This error condition is not implementable when using tessellation or
geometry shaders.  The text was also removed from the ES 3.2 spec.
I believe the intended behavior is to remove the error condition
when either OES_geometry_shader or OES_tessellation_shader are
exposed.

v2: Quote a better part of issue 13 (suggested by Ian).

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>