pgsql: Fix outdated src/test/mb/ tests, and add a GB18030 test.

Fix outdated src/test/mb/ tests, and add a GB18030 test.

The expected-output files for these tests were broken by the recent
addition of a warning for hash indexes.  Update them.

Also add a test case for GB18030 encoding, similar to the other ones.
This is a pretty weak test, but it's better than nothing.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/07af523870bcfe930134054febd3a6a114942e5b

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       |   87 ++++++++++++++++++++++++++++++++
src/test/mb/expected/mule_internal.out |    2 +
src/test/mb/expected/sjis.out          |    1 +
src/test/mb/expected/utf8.out          |    1 +
src/test/mb/mbregress.sh               |   11 +++-
src/test/mb/sql/gb18030.sql            |   19 +++++++
10 files changed, 124 insertions(+), 1 deletion(-)