[SAC] [OSGeo] #1171: Update OTB to 3.18.1

[OSGeo]

#1171: Update OTB to 3.18.1
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 Reporter:  manuelgrizonnet  |       Owner:  sac@…              
     Type:  task             |      Status:  new                
 Priority:  normal           |   Milestone:                     
Component:  Systems Admin    |    Keywords:                     
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Ticket URL: <http://trac.osgeo.org/osgeo/ticket/1171>
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