Re: WineD3D: compile against standard GL headers

[Stefan Dösinger]

> - GL_ARB_multisample & GL_EXT_vertex_weighting also define new
>
> functions, you should add those as well.

While we're at it, GL_EXT_vertex_weighting can be removed altogether. WineD3D 
only checks for it, but does not use it, and it has been discontinued in 
favor of vertex shaders or GL_ARB_vertex_blend.