[MacPorts] #56975: livecheck broken in GitHub PortGroup

[MacPorts]

#56975: livecheck broken in GitHub PortGroup
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  Reporter:  l2dy        |      Owner:  (none)
      Type:  defect      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  worksforme  |   Keywords:
      Port:              |
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Comment (by cjones051073):

 OK. In that case I will submit what I have so far as a PR. Most of the
 changes are simply to implement the option to pass a Header to the curl
 fetch, which would be needed regardless of if and where it is used...

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Ticket URL: <https://trac.macports.org/ticket/56975#comment:16>
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