www/nginx-full: fix package build

nginx-full requires either to enable GSSAPI_MIT or GSSAPI_HEIMDAL but
none is enabled. As a result, fails to build bibary package on package
build cluster.

PR: 275262
Approved by: maintainer timeout

(cherry picked from commit aa8f9390170e1e4f8470ccd7f03e54ab0ba77e61)