[MacPorts] #31015: supertux: add app icon

[MacPorts]

#31015: supertux: add app icon
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 Reporter:  ryandesign@…             |       Owner:  adamw@…          
     Type:  enhancement              |      Status:  new              
 Priority:  Normal                   |   Milestone:                   
Component:  ports                    |     Version:  2.0.1            
 Keywords:  haspatch                 |        Port:  supertux         
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 This patch simplifies the supertux port using the new app portgroup and
 adds an icon to the app bundle. Using the app portgroup also fixes the
 directory into which the app gets installed.

 In addition, the patch makes two other recommended changes: rewriting the
 dependencies to ensure that non-MacPorts versions of those libraries will
 not satisfy them, and indicating what license the software is under.

 May I commit it?

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Ticket URL: <https://trac.macports.org/ticket/31015>
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