Various compilation fixes

Various compilation errors I encountered on Windows, macOS and Linux.

OpenMP is now handled in OTB itself with the OTB_USE_OPENMP setting.

include/otbSARDEMPolygonsAnalysisImageFilter.txx

@@ -1027,10 +1027,10 @@ namespace otb
     InputIterator  InIt_LL(this->GetInput(), inputRegionForThread);
 
     // Allocate Vectors for polygon storage for this line of DEM
-    std::vector<ImageInPixelType> Polygon_SideInUp_VecLine [nbDEMLines];
-    std::vector<ImageInPixelType> Polygon_SideInDown_VecLine [nbDEMLines];
-    std::vector<ImageInPixelType> Polygon_SideOutUp_VecLine [nbDEMLines];
-    std::vector<ImageInPixelType> Polygon_SideOutDown_VecLine [nbDEMLines];
+    std::vector<ImageInPixelType> * Polygon_SideInUp_VecLine = new std::vector<ImageInPixelType>[nbDEMLines];
+    std::vector<ImageInPixelType> * Polygon_SideInDown_VecLine  = new std::vector<ImageInPixelType>[nbDEMLines];
+    std::vector<ImageInPixelType> * Polygon_SideOutUp_VecLine  = new std::vector<ImageInPixelType>[nbDEMLines];
+    std::vector<ImageInPixelType> * Polygon_SideOutDown_VecLine  = new std::vector<ImageInPixelType>[nbDEMLines];
 
 
     // Pixel of otb::VectorImage (input) : 4 Components : C, L, Z and Y
@@ -1238,7 +1238,11 @@ namespace otb
 	  }
     
       } // End lines (Main output)
-  
+
+  delete [] Polygon_SideInUp_VecLine;
+  delete [] Polygon_SideInDown_VecLine;
+  delete [] Polygon_SideOutUp_VecLine;
+  delete [] Polygon_SideOutDown_VecLine;
 }