Native bindings to the NV_vertex_array_range2 extension.

Enabling and disabling the vertex array range is specified by the original NV_vertex_array_range extension specification to flush the vertex array range implicitly. In retrospect, this semantic is extremely misconceived and creates terrible performance problems for any application that wishes to mix conventional vertex arrays with vertex arrange range-enabled vertex arrays.

This extension provides a new token for enabling/disabling the vertex array range that does NOT perform an implicit vertex array range flush when the enable/disable is performed.

Requires NV_vertex_array_range.