kni: fix build on Ubuntu-hybrids
kni: fix build on Ubuntu-hybrids

In the case where a userspace reports itself as Ubuntu, but the
kernel isn't providing the expected version signature interface,
turn off Ubuntu specializations.

This situation happens often enough in development environments,
and with multi-distribution build servers (e.g. chroot, containers).

Signed-off-by: Alexander Guy <e46fc836cca3acec03944314d1457c2ae6c68ef3@andern.org>
Acked-by: Thomas Monjalon <ee2fa8b2681c737f775687e475dcbf2028a412f1@6wind.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk