REFACT: Remove unused mutex

include/otbSARDEMPolygonsAnalysisImageFilter2.h

@@ -28,7 +28,6 @@
 #include "itkImageToImageFilter.h"
 #include "itkSmartPointer.h"
 #include "itkPoint.h"
-#include "itkSimpleFastMutexLock.h"
 
 #include "itkImageScanlineConstIterator.h"
 #include "itkImageScanlineIterator.h"
@@ -138,8 +137,6 @@ public:
   using FunctionType      = TFunction;
   using FunctionPointer   = typename FunctionType::Pointer;
 
-  using MutexType         = itk::SimpleFastMutexLock;
-
   // Typedef for iterators
   using InputIterator     = itk::ImageScanlineConstIterator< ImageInType >;
   using OutputIterator    = itk::ImageScanlineIterator< ImageOutType >;