[MacPorts] #62260: github and bitbucket portgroups: Remove post-extract block

[MacPorts]

#62260: github and bitbucket portgroups: Remove post-extract block
-------------------------------+-----------------------
  Reporter:  ryandesign        |      Owner:  (none)
      Type:  defect            |     Status:  new
  Priority:  Normal            |  Milestone:
 Component:  ports             |    Version:
Resolution:                    |   Keywords:  portgroup
      Port:  github bitbucket  |
-------------------------------+-----------------------

Comment (by ryandesign):

 The github portgroup's post-extract block was removed in
 [c97c7bdae9e90d22924637f003eefb7b568ad25b/macports-ports]. The bitbucket
 portgroup's is still there.

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Ticket URL: <https://trac.macports.org/ticket/62260#comment:7>
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