Remove repeated calls to PQserverVersion

[Peter Smith]

Hi,

I found a few functions making unnecessary repeated calls to
PQserverVersion(conn); instead of just calling once and assigning to a
local variable.

PSA a little patch which culls those extra calls.

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Kind Regards,
Peter Smith.
Fujitsu Australia

v1-0001-Avoid-unnecessary-calls-to-PGserverVersion.patch
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