security/heimdal: Fix build

Fix build due to many undefined symbols listed in version.map. The
problem is that the listed functions are conditionally built and since
they exist in FreeBSD they are not built but they are still referenced
in version.map.

PR: 275979
Approved by: portmgr (just fix it)

(cherry picked from commit 64f7f98bb61947a72001a84f06840c374b26628d)