added wgl_bind_to_texture_depth_nv to ConvertAttribWGLtoGLX

[Roderick Colenbrander]

> This patch doesn't implement the format, simply says that is can't be
> converted. This is my first patch, sorry if the format is wrong.

Ok not converting the format is fine but you are also changing the return value of wglMakeCurrent. Resubmit the patch without that unneeded change.

Roderick
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