[MacPorts] #44208: Update gshhg-gmt 2.3.0 to 2.3.1

#44208: Update gshhg-gmt 2.3.0 to 2.3.1 ----------------------------------+-------------------------------- Reporter: florian@… | Owner: macports-tickets@… Type: update | Status: new Priority: Normal | Milestone: Component: ports | Version: Keywords: haspatch, maintainer | Port: gshhg-gmt ----------------------------------+-------------------------------- Please commit the portfile patch. Thanks. -- Ticket URL: <https://trac.macports.org/ticket/44208> MacPorts <http://www.macports.org/> Ports system for OS X