[MacPorts] #28087: bump vigra to 1.7.1

[MacPorts]

#28087: bump vigra to 1.7.1
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 Reporter:  michaelld@…             |       Owner:  benjamin.seppke@…        
     Type:  defect                  |      Status:  new                      
 Priority:  Normal                  |   Milestone:                           
Component:  ports                   |     Version:  1.9.2                    
 Keywords:                          |        Port:  vigra                    
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Comment(by michaelld@…):

 Moving to vigra 1.7.1 also allows 'lprof' to use it instead of an internal
 vigra version that doesn't work well with the new libpng14.

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Ticket URL: <https://trac.macports.org/ticket/28087#comment:1>
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