[MacPorts] #54670: MacVim @8.0.snapshot136: Improve error report for MacVim mvim script for a bad link

[MacPorts]

#54670: MacVim @8.0.snapshot136: Improve error report for MacVim mvim script for a
bad link
----------------------+----------------------
  Reporter:  decibel  |      Owner:  raimue
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:
Resolution:           |   Keywords:  upstream
      Port:  MacVim   |
----------------------+----------------------
Changes (by raimue):

 * keywords:   => upstream


Comment:

 As the MacVim port merely distributes the [https://github.com/macvim-
 dev/macvim/blob/master/src/MacVim/mvim mvim script from upstream], I would
 kindly ask you to file an issue/pull request with upstream to get this
 fixed.

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Ticket URL: <https://trac.macports.org/ticket/54670#comment:2>
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