[MacPorts] #23461: Add debug mode variant

#23461: Add debug mode variant -------------------------+-------------------------------------------------- Reporter: y8@… | Owner: macports-tickets@… Type: enhancement | Status: new Priority: Normal | Milestone: Component: ports | Version: 1.8.2 Keywords: | Port: nginx -------------------------+-------------------------------------------------- Enables extended debug log. -- Ticket URL: <http://trac.macports.org/ticket/23461> MacPorts <http://www.macports.org/> Ports system for Mac OS