[MacPorts] #40921: Update pianobar to 2013.09.15

[MacPorts]

#40921: Update pianobar to 2013.09.15
----------------------------+--------------------------------
 Reporter:  brian.andrew@…  |      Owner:  macports-tickets@…
     Type:  update          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.2.0
 Keywords:  haspatch        |       Port:  pianobar
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 Needs assigned to gmail.com:aguynamedryan+pianobar .

 Updates pianobar to 2013.09.15.  Tried to clean up the Portfile too.  It
 looks like the Makefile stomps on a bunch of the information we were
 passing in as builds args, so I removed that.  Seems to compile fine for
 me (10.8.5, XCode 5.0.1.)  Also moved to using the github portgroup and
 official repo.

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Ticket URL: <https://trac.macports.org/ticket/40921>
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