[MacPorts] #28087: bump vigra to 1.7.1

[MacPorts]

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

Comment(by michaelld@…):

 Note: revert the vigra/Portfile to its original state before applying this
 patch.  Make sure the "files/..." is created and the patch exists --
 sometimes you have to create the "files" directory first IME.

-- 
Ticket URL: <https://trac.macports.org/ticket/28087#comment:7>
MacPorts <http://www.macports.org/>
Ports system for Mac OS