Turn

  virPCIDeviceAddressIsEmpty()
  virDeviceInfoPCIAddressIsWanted()
  virDeviceInfoPCIAddressIsPresent()

from inline functions to regular functions.
Signed-off-by: NAndrea Bolognani <abologna@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>