[MacPorts] #52626: Remove svn.macports.org distfiles fallback

[MacPorts]

#52626: Remove svn.macports.org distfiles fallback
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  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:  MacPorts 2.3.5
 Component:  base          |    Version:  2.3.4
Resolution:                |   Keywords:
      Port:                |
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Comment (by ryandesign@…):

 It's a base issue; see
 browser:trunk/base/src/port1.0/portfetch.tcl?rev=146644#L119

 I don't know if we can just set `fallback_mirror_site` to empty or if we
 have to remove all references to `fallback_mirror_site` from the code.

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Ticket URL: <https://trac.macports.org/ticket/52626#comment:2>
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