wined3d: Update detection of vertex blend capabilities

[Henri Verbeet]

On 2 January 2011 10:52, Jeremy Chin <rekless at fastmail.fm> wrote:
> Newer video cards have stopped reporting the ARB_VERTEX_BLEND GL capability,
> but ARB_VERTEX_PROGRAM implies the same capability.
>
I don't think so. If this works at all it's probably because you're
passing some previous value of gl_max (like GL_MAX_TEXTURE_UNITS_ARB)
for the number of blend matrices.