pgsql: Fix improper initialization order for readline.

Fix improper initialization order for readline.

Turns out we must set rl_basic_word_break_characters *before* we call
rl_initialize() the first time, because it will quietly copy that value
elsewhere --- but only on the first call.  (Love these undocumented
dependencies.)  I broke this yesterday in commit 2ec477dc8108339d;
like that commit, back-patch to all active branches.  Per report from
Pavel Stehule.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/acb6c64f4a3628ea7005b3c492633a71e52c95ff

Modified Files
--------------
src/bin/psql/input.c |    4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)