sysutils/syslog-ng: Update to 3.37.1

Update to 3.37.1 and apply a number of other fixes supplied by our
upstream that didn't make it into the release.

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

Submitted by:	Peter Czanik (CzP) <peter.czanik@oneidentity.com>
		Balabit (a OneIdentity company) / syslog-ng upstream