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Make the VNC authentication build with LibreSSL on HardenedBSD and TrueOS.

Description

Make the VNC authentication build with LibreSSL on HardenedBSD and TrueOS.

PR: 219790
Submitted by: Shirkdog <mshirk@daemon-security.com>
Reviewed by: grehan and rgrimes
MFC after: 4 weeks.
Sponsored by: iXsystems, Inc.
Differential Revision: https://reviews.freebsd.org/D11071