[MacPorts] #43704: unify the use of +threads as a variant name

[MacPorts]

#43704: unify the use of +threads as a variant name
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  Reporter:  mojca                             |      Owner:  macports-
                                               |  tickets@…
      Type:  enhancement                       |     Status:  new
  Priority:  Normal                            |  Milestone:
 Component:  ports                             |    Version:
Resolution:                                    |   Keywords:
      Port:  boost cherokee gauche hdf5 raxml  |
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Changes (by mf2k):

 * cc: michael@… (removed)


Comment:

 See #58384.

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Ticket URL: <https://trac.macports.org/ticket/43704#comment:7>
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