[MacPorts] #54313: libosinfo: Fix license

[MacPorts]

#54313: libosinfo: Fix license
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 Reporter:  ryandesign  |      Owner:  danchr
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  libosinfo
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 The port claims to be licensed under "GPL-2.1+". There is a GPL 2, and
 there is an LGPL 2.1, but there is no GPL 2.1. Please clarify the license.

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Ticket URL: <https://trac.macports.org/ticket/54313>
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