Log Message:
Improve tap handling: pass bridge name to qemu-ifup (partially from
Roman Shaposhnik via xen-devel) as qemu-xen-traditional does.
Also set an XEN_DOMAIN_ID environnement variable, so that the xenstore can
be looked up from qemu scripts.

While there, check /usr/include/xen/xenio.h presense instead of relying
only on ONLY_FOR_PLATFORM. This way this package can be built on recent
9.0_STABLE.
Bump PKGREVISION.