security/heimdal: Establish consistency for seed data with base heimdal

This patch enables heimdal port and heimdal bad to be consistent [in byte
order for seed data] and talk nicely to each other. Please refer to
FreeBSD Errata Notice FreeBSD-EN-14:08.heimdal. This port is not
unmaintained.

PR: 191356
Submitted by: dewayne (heuristicsystems.com.au)