virt: Add virt directory to the top Makefile

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: Feng Wu <[email protected]>
Acked-by: Michal Marek <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
2 files changed