ENCTYPE_NULL is defined by the RFC and used by MIT Kerberos. Heimdal
also provides ENCTYPE_NULL.
Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue Apr 26 22:47:19 CEST 2016 on sn-devel-144