We need to build files in virt/lib/, which are now used by
KVM and VFIO, so add virt directory to the top Makefile.
Signed-off-by: NFeng Wu <feng.wu@intel.com>
Acked-by: NMichal Marek <mmarek@suse.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>