[MacPorts] #51873: tDOM: use github portgroup

[MacPorts]

#51873: tDOM: use github portgroup
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 Reporter:  ryandesign@…  |      Owner:  neumann@…
     Type:  enhancement   |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.4
 Keywords:  haspatch      |       Port:  tDOM
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 This patch makes the port the github portgroup, instead of specifying the
 download location manually. This insulates the port from possible future
 changes to the github infrastructure, since we can make adjustments to
 just the github portgroup to automatically fix all ports using it.

 I can commit this change for you if you have no objections.

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Ticket URL: <https://trac.macports.org/ticket/51873>
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