Fix GSSAPI-based, and NLS-less, builds.

This was also tested on a live 12.0 amd64 machine,
11.2-arm64 and 11.2-i386 poudriere boxes with base GSSAPI.

PR: 234740
Reported by: Peter Putzer (Bugzilla), Alex V. Petrov (e-mail)
Approved by: Corey Halpin (maintainer)