[MacPorts] #60802: gopls downloads things at build time

[MacPorts]

#60802: gopls downloads things at build time
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  ra1nb0w
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  gopls
------------------------+----------------------
 When I build gopls I see:

 {{{
 go: downloading mvdan.cc/xurls/v2 v2.2.0
 go: downloading honnef.co/go/tools v0.0.1-2020.1.4
 go: downloading golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543
 go: downloading github.com/sergi/go-diff v1.1.0
 go: downloading golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
 go: downloading golang.org/x/mod v0.2.0
 go: downloading github.com/BurntSushi/toml v0.3.1
 }}}

 Ports shouldn't download files at build time. Download everything you need
 using distfiles in the fetch phase.

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Ticket URL: <https://trac.macports.org/ticket/60802>
MacPorts <https://www.macports.org/>
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