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
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/efc1610b64b04e7cf08cc1d6c608ede8b7d5ff07

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(-)