pgsql: Fix compiler warning about unused function in non-readline case.

Fix compiler warning about unused function in non-readline case.

Backpatch to all live branches to keep the code in sync.

Branch
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REL9_3_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/729d0056b42a512648e49daa727e5fe77d0cfeeb

Modified Files
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src/bin/psql/input.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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