pgsql: Keep perl style checker happy

Keep perl style checker happy

It doesn't like code before "use strict;".

(cherry picked from commit ed2c2d063bd110f299211611b72a5dbe07a4d7be)

Branch
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REL9_2_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/4c1f42f588917225db16f3a6de62411a51bf3037

Modified Files
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src/backend/catalog/genbki.pl | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)