[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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 Vigra has progressed somewhat since 1.6.  Here's a Portfile patch to
 augment it to 1.7.1; I've included some variants that are now available,
 though maybe they should just be always used?  The 'numpy' one does not
 work yet, since I could not find a way to install Boost::Python -- so I
 commented out that variant's code for now.  This change might fix ticket
 #25315.

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