[MacPorts] #29894: Update libpano13 from 2.9.17 to 2.9.18

[MacPorts]

#29894: Update libpano13 from 2.9.17 to 2.9.18
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 Reporter:  hvdwolf@…          |       Owner:  freespace+macforge@…        
     Type:  update             |      Status:  new                         
 Priority:  Normal             |   Milestone:                              
Component:  ports              |     Version:                              
 Keywords:  haspatch           |        Port:  libpano13                   
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Comment(by hvdwolf@…):

 Updated the patch. Set the correct revision number according the rules

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Ticket URL: <https://trac.macports.org/ticket/29894#comment:3>
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