[MacPorts] #28390: alliance: build failure with libpng 1.4

[MacPorts]

#28390: alliance: build failure with libpng 1.4
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  Reporter:  theshadow27@…          |       Owner:  and.damore@…           
      Type:  defect                 |      Status:  closed                 
  Priority:  Normal                 |   Milestone:                         
 Component:  ports                  |     Version:  1.9.2                  
Resolution:  fixed                  |    Keywords:  png                    
      Port:  alliance               |  
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Comment(by and.damore@…):

 So long for the port update policy.

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Ticket URL: <https://trac.macports.org/ticket/28390#comment:7>
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