[MacPorts] #19811: lilypond: update to 2.12.2

[MacPorts]

#19811: lilypond: update to 2.12.2
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 Reporter:  ryandesign@…             |       Owner:  snc@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  1.7.1           
 Keywords:                           |        Port:  lilypond        
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 lilypond is at 2.12.1 but 2.12.2 is out so the port should probably be
 updated.

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Ticket URL: <http://trac.macports.org/ticket/19811>
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