[MacPorts] #42647: Update libupnp to 1.6.19

[MacPorts]

#42647: Update libupnp to 1.6.19
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  Reporter:  ctreleaven@…  |      Owner:  macports-tickets@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.2.1
Resolution:                |   Keywords:  haspatch
      Port:  libupnp       |
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Comment (by ctreleaven@…):

 Sorry, the Type field should have been set to "Update" but I can't fix it
 now.

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Ticket URL: <https://trac.macports.org/ticket/42647#comment:1>
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