[MacPorts] #54814: byacc @20170719: upgrade fails due to missing source

[MacPorts]

#54814: byacc @20170719: upgrade fails due to missing source
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  Reporter:  mathomp4  |      Owner:  tobypeterson
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.4.1
Resolution:            |   Keywords:
      Port:  byacc     |
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Comment (by tobypeterson):

 Yes, I believe that’s correct re the FTP server. I won’t have computer
 access for a couple weeks, so perhaps someone else can fix it. I’d also be
 able to easily approve a github PR...

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Ticket URL: <https://trac.macports.org/ticket/54814#comment:2>
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