Fix failure to rotate postmaster log file for size reasons on Windows.
When we eliminated "unnecessary" wakeups of the syslogger process, we broke size-based logfile rotation on Windows, because on that platform data transfer is done in a separate thread. While non-Windows platforms would recheck the output file size after every log message, Windows only did so when the control thread woke up for some other reason, which might be quite infrequent. Per bug #7814 from Tsunezumi. Back-patch to 9.2 where the problem was introduced. Jeff Janes
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