[CentOS] cent0s-6 and virtualbox

> Indication was when they supported (or just
> forced, cant remember witch) Virtualization only on x86_64 on
> RHEL/CentOS 5.x.
>

They only support KVM as a host technology for virtualization now. KVM
requires the CPU virtualization extensions to function. The functions
are only available on the CPU when in 64bit (long) mode.

There are sound technical reasons for this and it wasn't just them
being stubborn to drop an architecture.