Support configurable eventlog application names on Windows

Magnus Hagander <magnus@hagander.net>

Commit: d8ea33f2c02721c89c2434b9fda170afb7fe4999
Author: Magnus Hagander <magnus@hagander.net>
Date: 2011-10-25T18:02:55Z
Releases: 9.2.0
Support configurable eventlog application names on Windows

This allows different instances to use the eventlog with different
identifiers, by setting the event_source GUC, similar to how
syslog_ident works.

Original patch by MauMau, heavily modified by Magnus Hagander

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