[MacPorts] #60020: rtl-sdr @20191203-b5af355b: license is GPL-2, shouldn't it be GPL-2+ +/- LGPL-2.1+ ?

[MacPorts]

#60020: rtl-sdr @20191203-b5af355b: license is GPL-2, shouldn't it be GPL-2+ +/-
LGPL-2.1+ ?
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  Reporter:  tenzap   |      Owner:  michaelld
      Type:  defect   |     Status:  assigned
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.6.2
Resolution:           |   Keywords:
      Port:  rtl-sdr  |
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Comment (by tenzap):

 Replying to [comment:3 michaelld]:
 > I just changed it to GPL-2+ ... does that fix your issue?

 To test it I guess I need to trigger a rebuild of the welle.io package on
 the MacPort builders.
 I checked in the Wiki but couldn't find a way to do that apart from
 submitting a new updated welle.io Portfile . Do you know of another way ?

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Ticket URL: <https://trac.macports.org/ticket/60020#comment:5>
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