MFH: r544946

net-mgmt/snmptt: Update to 1.4.2, Fix security issue

Changelog: http://snmptt.sourceforge.net/changelog.shtml

PR: 248162
Submitted by: nistor@snickers.org (maintainer)
Security: b8ea5b66-deff-11ea-adef-641c67a117d8

Approved by: ports-secteam (blanket: bug and security fix release)