[MacPorts] #28276: arb: Upgrade to 5.2

[MacPorts]

#28276: arb: Upgrade to 5.2
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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@…):

 Additional testing revealed a few glitches in the ARB port.  Uploaded
 files Portfile.2.diff and arb_macsetup.2.diff address them.  One was a
 missing dependency and the other was a problem writing the .xmodmap file.

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Ticket URL: <https://trac.macports.org/ticket/28276#comment:20>
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