[MacPorts] #58935: go @1.13: build fails on 10.9 and less

[MacPorts]

#58935: go @1.13: build fails on 10.9 and less
-------------------------------+----------------------
 Reporter:  kencu              |      Owner:  ci42
     Type:  defect             |     Status:  assigned
 Priority:  Normal             |  Milestone:
Component:  ports              |    Version:
 Keywords:  lion mountainlion  |       Port:  go
-------------------------------+----------------------
 I saw this on my 10.7 system this morning, and
 <https://ports.macports.org/port/go/builds> shows it affects 10.9 and
 less.

 The special tweaks put in the Portfile to use `legacysupport` to provide
 the missing symbols to `go` will need to be looked at and updated.

-- 
Ticket URL: <https://trac.macports.org/ticket/58935>
MacPorts <https://www.macports.org/>
Ports system for macOS