[MacPorts] #33893: wcslib: update to version 4.13.4

[MacPorts]

#33893: wcslib: update to version 4.13.4
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 Reporter:  swinbank@…                 |       Owner:  macports-tickets@…                   
     Type:  update                     |      Status:  new                                  
 Priority:  Normal                     |   Milestone:                                       
Component:  ports                      |     Version:  2.0.4                                
 Keywords:                             |        Port:  wcslib                               
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Comment(by swinbank@…):

 By the way, in #28759 I was asked to remove variants for older versions of
 gcc, but I see the file which was actually committed to Macports had them
 included. I've removed them again here since I only tested with gcc46.

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Ticket URL: <https://trac.macports.org/ticket/33893#comment:1>
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