mesa: relax draw api validation on ES2

Patch fixes failing test in WebGL conformance test
'point-no-attributes' when running Chrome on OpenGL ES.
(Shader program may draw points using constant data in shader.)

No Piglit regressions.

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
1 file changed