COMP: typename outside template for gcc4.6 and MSVC compiler

Applications/DisparityMap/otbGeneratePlyFile.cxx

@@ -109,7 +109,7 @@ private:
     it.GoToBegin();
 
     FloatImageType::IndexType lr, ul;
-    typedef typename FloatImageType::IndexType::IndexValueType IndexValueType;
+    typedef FloatImageType::IndexType::IndexValueType IndexValueType;
     lr.Fill(itk::NumericTraits<IndexValueType>::Zero);
     ul.Fill(itk::NumericTraits<IndexValueType>::Zero);