Seems a backport miss. An extra member is passed to struct
virLXCBasicMountInfo.
Signed-off-by: NYang hongyang <hongyang.yang@easystack.cn>

Commit bda5f2bd (a backport of commit 24710414) listed one more value
than the virLXCBasicMountInfo has here, because v1.2.9-maint does
not have the skipNoNetns bool (introduced by commit ba9b7252 released
in 1.2.11).
Signed-off-by: NJán Tomko <jtomko@redhat.com>