wined3d: Get rid of the now redundant max_ffp_texture_stages device field.
[wine] / dlls / wined3d / wined3d.spec
1 @ stdcall WineDirect3DCreate(long ptr)
2 @ stdcall WineDirect3DCreateClipper(ptr)
3 @ stdcall wined3d_mutex_lock()
4 @ stdcall wined3d_mutex_unlock()