It is not used by linux-user, otherwise I need to to create one stub
for migration_is_idle() on following patch.
Signed-off-by: NJuan Quintela <quintela@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: Nzhanghailiang <zhang.zhanghailiang@huawei.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>