override: domain: Implement override for virDomainGetAutostartOnce()

The bindings generator can't generate proper bindings for
virDomainGetAutostartOnce() (because of int* in the arguments) so
implement it manually.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>

generator.py

@@ -440,6 +440,7 @@ skip_impl = {
     'virNodeDeviceGetAutostart',
     'virDomainSaveParams',
     'virDomainRestoreParams',
+    'virDomainGetAutostartOnce',
 
     'virDomainLxcOpenNamespace',