[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@…):

 Replying to [comment:37 ryandesign@…]:
 > I think next up is the actual update to 5.2 (and that might be the last
 change needed?). I've attached what I think should be in that commit. It:
 > Does this patch look ok to commit?

 One minor problem with capitalization of PREFIX in arb_macsetup needed
 attention.  I uploaded arb_macsetup.3.diff to address this issue.  Other
 than that your proposed-5.2 update builds and runs without any errors.
 Please commit.

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Ticket URL: <https://trac.macports.org/ticket/28276#comment:39>
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