Even if the installation defaults to escape output, this makes
pg_regress make the setting hex, so that installcheck tests can pass in
such a setting.

Jeff Janes.

Discussion: http://postgr.es/m/CAMkU=1xivkTNeyCfzhwdHJ+VH5qpU+4gsipRNuEUbyQf+KN3Kw@mail.gmail.com