Use correct format placeholder for WSAGetLastError()

Peter Eisentraut <peter@eisentraut.org>

Commit: 9486844f301e265a3ad11b612decaba2462c3c15
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2021-04-23T12:21:37Z
Releases: 14.0
Use correct format placeholder for WSAGetLastError()

Some code thought this was unsigned, but it's signed int.

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