pgsql: Stop a few regression tests from needlessly disabling GEQO.

Log Message:
-----------
Stop a few regression tests from needlessly disabling GEQO. This was
necessary in 1997, when geqo_threshold did not exist, but it is no
longer needed.

Modified Files:
--------------
    pgsql/src/test/regress/expected:
        geometry.out (r1.25 -> r1.26)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/geometry.out.diff?r1=1.25&r2=1.26)
        geometry_1.out (r1.10 -> r1.11)

(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/geometry_1.out.diff?r1=1.10&r2=1.11)
        geometry_2.out (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/geometry_2.out.diff?r1=1.7&r2=1.8)
        point.out (r1.16 -> r1.17)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/point.out.diff?r1=1.16&r2=1.17)
        tinterval.out (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/tinterval.out.diff?r1=1.12&r2=1.13)
    pgsql/src/test/regress/sql:
        geometry.sql (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/geometry.sql.diff?r1=1.10&r2=1.11)
        point.sql (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/point.sql.diff?r1=1.12&r2=1.13)
        tinterval.sql (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/tinterval.sql.diff?r1=1.7&r2=1.8)