[MacPorts] #52391: darwinbuild-legacy: update for move to GitHub

[MacPorts]

#52391: darwinbuild-legacy: update for move to GitHub
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 Reporter:  ryandesign@…  |      Owner:  wms@…
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.4
 Keywords:                |       Port:  darwinbuild-legacy
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 Same as the darwinbuild port, as reported in #52355, the darwinbuild-
 legacy port needs to be updated for the move to GitHub.

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Ticket URL: <https://trac.macports.org/ticket/52391>
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