[MacPorts] #57717: archive_site_local doesn't work at all

[MacPorts]

#57717: archive_site_local doesn't work at all
------------------------+----------------------------
 Reporter:  ryandesign  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:  MacPorts 2.6.0
Component:  base        |    Version:  2.5.4
 Keywords:              |       Port:
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 Setting `archive_site_local` in macports.conf (or `ARCHIVE_SITE_LOCAL` in
 the environment) simply does not have any effect. This feature was
 [changeset:da038b881b74ee5c57a44f24ec949228a022d2c2/macports-base broken]
 two years ago in MacPorts 2.3.5.

 There used to be three "extras" when specifying a class of URLs to
 `portfetch::checksites`, and in #52626 we removed the second "extra"—the
 svn.macports.org fallback—but we forgot to remove the second "extra"
 placeholder when calling it for `archive_sites`.

 I will submit a PR to fix this.

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Ticket URL: <https://trac.macports.org/ticket/57717>
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