Test various --with-gssapi options in GitLab CI

The implicit ./configure default is to use --with-gssapi=auto.  There is
already a GitLab CI job (gcc:stretch:amd64) which uses --without-gssapi.
Add four more forms of the --with-gssapi option to various GitLab CI job
configurations so that its every possible variant is regularly tested.
80 jobs for !5348 with 2866-6b0b0c6aba2488f8db5d6cdbc44162b98ffa5ed4-breaks-using-with-mit-kerberos in 27 minutes and 24 seconds (queued for 23 seconds)
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