[MacPorts] #60558: mirror_sites.tcl: trimming and updating

[MacPorts]

#60558: mirror_sites.tcl: trimming and updating
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  Reporter:  iEFdev  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  base    |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:          |
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Comment (by iEFdev):

 Replying to kencu (Ken):
 > all the https links will likely fail on older systems about 10.9 and
 less unless users have followed my bootstrap procedure.

 Could `${distfiles_scheme}://` be utilized (more) for that? Like
 [https://github.com/macports/macports-
 ports/blob/master/_resources/port1.0/fetch/mirror_sites.tcl#L509 here].

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Ticket URL: <https://trac.macports.org/ticket/60558#comment:1>
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