[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
 Keywords:  haspatch      |       Port:  libupnp
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 Attached patch updates the libupnp port to 1.6.19 (existing version was ~6
 years old) to pick up an extensive list of changes, including security
 patches.

 Builds successfully on 10.6.8/XCode 3.2.6 and 10.9.2/XCode 5.mumble.
 However, VLC still does not see my primary UPNP source (MythTV).  Only
 other dependent is uShare which is, I think, pretty much defunct.

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