[MacPorts] #62325: some sourceforge mirrors serve HTML instead of redirecting

[MacPorts]

#62325: some sourceforge mirrors serve HTML instead of redirecting
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 Reporter:  jmroot  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:
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 Most recently, octave-optim failed to mirror because of this, and I
 remember seeing a few reports of issues with other ports.

 I guess we have two choices:
  1. always avoid redirects (will require work on many older ports
 including ones using the octave portgroup), or
  2. try to identify the bad mirrors and remove them until/unless they are
 fixed. The problematic one for octave-optim was `phoenixnap`.

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Ticket URL: <https://trac.macports.org/ticket/62325>
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