[MacPorts] #28276: Upgrade ARB 5.2 -> 5.2.1

[MacPorts]

#28276: Upgrade ARB 5.2 -> 5.2.1
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 Reporter:  matt.cottrell@…       |       Owner:  macports-tickets@…                   
     Type:  update                |      Status:  new                                  
 Priority:  Normal                |   Milestone:                                       
Component:  ports                 |     Version:  1.9.2                                
 Keywords:  libpng                |        Port:  arb                                  
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Comment(by matt.cottrell@…):

 Patching the ARB source for libpng14.dylib compatibility was not as
 difficult as I thought it might be.  Please take a look and give it a try.

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Ticket URL: <https://trac.macports.org/ticket/28276#comment:7>
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