[MacPorts] #53167: libupnp @1.6.20: update to 1.6.21

[MacPorts]

#53167: libupnp @1.6.20: update to 1.6.21
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 Reporter:  l2dy    |      Owner:
     Type:  update  |     Status:  new
 Priority:  High    |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libupnp
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 CVE-2016-6255 and CVE-2016-8863.

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Ticket URL: <https://trac.macports.org/ticket/53167>
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