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

[MacPorts]

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

 Replying to [ticket:62260 ryandesign]:
 > The entire post-extract block should be superfluous as of MacPorts 2.6.0
 which creates a symlink of the expected name for you.

 This change in base was reverted after MacPorts 2.8.

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Ticket URL: <https://trac.macports.org/ticket/62260#comment:6>
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