Обсуждение: pgsql: Un-break pg_dump for pre-8.3 source servers.

Un-break pg_dump for pre-8.3 source servers.

Commit 07b39083c inserted an unconditional reference to pg_opfamily,
which of course fails on servers predating that catalog.  Fortunately,
the case it's trying to solve can't occur on such old servers (AFAIK).
Hence, just skip the additional code when the source predates 8.3.

Per bug #15955 from sly.  Back-patch to all supported branches,
like the previous patch.

Discussion: https://postgr.es/m/15955-1daa2e676e903d87@postgresql.org

Branch
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REL_12_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/6844adba54f7d96f30f834efc6d9aa1e52e5672d

Modified Files
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src/bin/pg_dump/pg_dump.c | 35 +++++++++++++++++++++--------------
1 file changed, 21 insertions(+), 14 deletions(-)