- Add xen devices to MAKEDEV
- Add Xen kernels to list of kernel to build
- Add INSTALL_XENU to the install kernels
- introduce the xbd disk devices to sysinst.
This will add 3 kernels to the i386 release:
XEN0 for use as a Xen domain0 kernel
XENU for use on a non-privileged domain
INSTALL_XENU to install NetBSD on a non-privileged domain virtual disk.