amd64 NVIDIA support in FreeBSD 7

[Kip Macy]

> Not to go on endlessly but also note this: "The FreeBSD kernel
> provides some support for this via cloning devices; the NVIDIA FreeBSD
> graphics driver used this interface for a while, but bugs/limitations
> and differences between kernel versions made it necessary to revert to
> regular device nodes.".  So the i386 port works without this feature
> but an amd64 port won't even get started without it?
>

It boils down to the fact that NVIDIA only has serious customer demand
for Linux. They're willing to support FreeBSD as a favor to us so long
as it is easy.

 -Kip