krb5int_copy_authdatum
retval = krb5int_copy_authdatum(context, elem,
retval = krb5int_copy_authdatum(context, inauthdat1[nelems],
retval = krb5int_copy_authdatum(context, inauthdat2[nelems2],
krb5int_copy_authdatum(krb5_context, const krb5_authdata *, krb5_authdata **);