
For now this will be enabled in tandem with GL_OES_geometry_shader. Should a driver come along that wants to separate them out, another enable can be added. Also adds the missed GL_OES_geometry_shader define in glcpp. Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu> Reviewed-by: Marta Lofstedt <marta.lofstedt@intel.com>