pgsql: Fix broken multibyte regression tests.

Fix broken multibyte regression tests.

commit 9043Fe390f4f0b4586cfe59cbd22314b9c3e2957 broke multibyte
regression tests because the commit removes the warning message when
temporary hash indexes is created, which has been added by commit
07af523870bcfe930134054febd3a6a114942e5b.

Back patched to 9.5 stable tree.

Branch
------
REL9_5_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/479cb1e420c40d78b49535c0ceeaa5f65c7d6797

Modified Files
--------------
src/test/mb/expected/big5.out          |    1 -
src/test/mb/expected/euc_jp.out        |    1 -
src/test/mb/expected/euc_kr.out        |    1 -
src/test/mb/expected/euc_tw.out        |    1 -
src/test/mb/expected/gb18030.out       |    1 -
src/test/mb/expected/mule_internal.out |    2 --
src/test/mb/expected/sjis.out          |    1 -
src/test/mb/expected/utf8.out          |    1 -
8 files changed, 9 deletions(-)