[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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 This is an upgrade of ARB 5.2 to 5.2.1.

 ARB was broken by the MacPorts upgrade from libpng 1.2.44 to 1.4.5 three
 weeks ago as identified by ticket #28238.  The solution for now is to
 explicitly specify in the makefile -l png12, which lives in
 /usr/X11R6/lib/libpng12.dylib.

 I'm including fixes to some minor issues as well.

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