Bug#500336: fix outline

[Bastian Blank]

The current config variables are as following:
- CONFIG_XEN is set for any Xen capable image.
- CONFIG_PARAVIRT is set for the images which can do both.
- CONFIG_XEN_PRIVILEGED_GUEST is currently set for anything which can be
  booted via a hypervisor.

So images with CONFIG_XEN and no CONFIG_PARAVIRT must not show up as
normal bootable.

Bastian

-- 
There is a multi-legged creature crawling on your shoulder.
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