[MacPorts] #40518: github portgroup github.master_sites should point to .../archive/... not .../tarball/...

[MacPorts]

#40518: github portgroup github.master_sites should point to .../archive/... not
.../tarball/...
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  Reporter:  fred.brunner@…  |      Owner:  macports-tickets@…
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.2.0
Resolution:                  |   Keywords:
      Port:  github          |
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Comment (by ryandesign@…):

 Yes, but in MacPorts we prefer to use distfiles, because they can be
 mirrored and checksummed and don't have to be fetched every time.

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Ticket URL: <https://trac.macports.org/ticket/40518#comment:5>
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