pgsql: Fix up several contrib modules that were using varlena datatypes

Log Message:
-----------
Fix up several contrib modules that were using varlena datatypes in not-so-obvious
ways.  I'm not totally sure that I caught everything, but at least now they pass
their regression tests with VARSIZE/SET_VARSIZE defined to reverse byte order.

Modified Files:
--------------
    pgsql/contrib/hstore:
        hstore.h (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore.h.diff?r1=1.2&r2=1.3)
        hstore_gist.c (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore_gist.c.diff?r1=1.2&r2=1.3)
        hstore_io.c (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore_io.c.diff?r1=1.6&r2=1.7)
        hstore_op.c (r1.4 -> r1.5)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/hstore/hstore_op.c.diff?r1=1.4&r2=1.5)
    pgsql/contrib/intarray:
        _int.h (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_int.h.diff?r1=1.12&r2=1.13)
        _int_bool.c (r1.10 -> r1.11)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_int_bool.c.diff?r1=1.10&r2=1.11)
        _intbig_gist.c (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/intarray/_intbig_gist.c.diff?r1=1.13&r2=1.14)
    pgsql/contrib/ltree:
        _ltree_gist.c (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/_ltree_gist.c.diff?r1=1.19&r2=1.20)
        _ltree_op.c (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/_ltree_op.c.diff?r1=1.9&r2=1.10)
        ltree.h (r1.17 -> r1.18)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree.h.diff?r1=1.17&r2=1.18)
        ltree_gist.c (r1.19 -> r1.20)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree_gist.c.diff?r1=1.19&r2=1.20)
        ltree_io.c (r1.13 -> r1.14)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree_io.c.diff?r1=1.13&r2=1.14)
        ltree_op.c (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltree_op.c.diff?r1=1.15&r2=1.16)
        ltxtquery_io.c (r1.12 -> r1.13)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/ltree/ltxtquery_io.c.diff?r1=1.12&r2=1.13)
    pgsql/contrib/pg_trgm:
        trgm.h (r1.5 -> r1.6)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/trgm.h.diff?r1=1.5&r2=1.6)
        trgm_gist.c (r1.8 -> r1.9)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/trgm_gist.c.diff?r1=1.8&r2=1.9)
        trgm_op.c (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/pg_trgm/trgm_op.c.diff?r1=1.7&r2=1.8)
    pgsql/contrib/tsearch2:
        gistidx.c (r1.15 -> r1.16)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/gistidx.c.diff?r1=1.15&r2=1.16)
        gistidx.h (r1.7 -> r1.8)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/gistidx.h.diff?r1=1.7&r2=1.8)
        query.c (r1.32 -> r1.33)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/query.c.diff?r1=1.32&r2=1.33)
        query.h (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/query.h.diff?r1=1.9&r2=1.10)
        query_rewrite.c (r1.6 -> r1.7)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/query_rewrite.c.diff?r1=1.6&r2=1.7)
        query_support.c (r1.3 -> r1.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/query_support.c.diff?r1=1.3&r2=1.4)
        query_util.c (r1.2 -> r1.3)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/contrib/tsearch2/query_util.c.diff?r1=1.2&r2=1.3)