[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-
      Type:  enhancement                       |  tickets@…
  Priority:  Normal                            |     Status:  new
 Component:  ports                             |  Milestone:
Resolution:                                    |    Version:
      Port:  boost cherokee gauche hdf5 raxml  |   Keywords:
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Changes (by petr@…):

 * port:  boost cherokee gauche hdf5 hdf5-18 raxml => boost cherokee gauche
     hdf5 raxml


Comment:

 Removing hdf5-18 again. It has become as stub w/o variants and can to be
 removed in few days.

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Ticket URL: <https://trac.macports.org/ticket/43704#comment:5>
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