to XSA244. Keep PKGREVISION to 1 to account for the fact that it's
not a stock Xen 4.8.2.
Note that, unlike upstream, pv-linear-pt defaults to true, so that
NetBSD PV guests (including dom0) will continue to boot without changes
to boot.cfg
This includes stub domains support, but it should be considered
experimental at this time. Stub domains hangs with serial ports,
or more more than one virual disk (multiple virtual ethernet have not been
tested).