sysutils/syslog-ng: Update to 4.3.0

Patch was created and tested by our upstream representative
Peter Czanik.

Version 4.3.1 of syslog-ng was released during the weekend: there was
a rare to appear crash bug in Python support (one needs to reference
the same Python parser multiple times in the configuration). Support
for OpenSearch was also added.

Submitted by: Peter Czanik (CzP) <peter.czanik@oneidentity.com>

		Balabit (a OneIdentity company) / syslog-ng upstream