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
------
REL9_1_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/db462a44e22dbaa945eabac7f73d2a240037f75e

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