CVE-2020-25721 mitigation: KDC must provide the new HAS_SAM_NAME_AND_SID buffer with sAMAccountName and ObjectSID values associated with the principal. The mitigation only works if NDR library supports the PAC_UPN_DNS_INFO_EX buffer type. In case we cannot detect it at compile time, a warning will be displayed at configure stage. Fixes: https://pagure.io/freeipa/issue/9031 Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com> Reviewed-by: Rob Crittenden <rcritten@redhat.com> Reviewed-By: Rob Crittenden <rcritten@redhat.com>