[MacPorts] #30817: linkchecker: simplify app creation, add icon

[MacPorts]

#30817: linkchecker: simplify app creation, add icon
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 Reporter:  ryandesign@…             |       Owner:  mww@…           
     Type:  enhancement              |      Status:  new             
 Priority:  Normal                   |   Milestone:                  
Component:  ports                    |     Version:  2.0.1           
 Keywords:  haspatch                 |        Port:  linkchecker     
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 The attached patch simplifies how the linkchecker port creates its app
 bundle, using the new app portgroup, and also adds an icon to it.

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Ticket URL: <https://trac.macports.org/ticket/30817>
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