vtkOStreamWrapper: add missing includes

This actually comes from `vtkSetGet.h` macros, but these seem to be the
only two files having issues (RogueResearch7's 10.11 builds).

Common/Core/vtkArrayIteratorTemplateInstantiate.cxx

@@ -16,6 +16,8 @@
 
 #include "vtkArrayIteratorTemplate.txx"
 
+#include "vtkOStreamWrapper.h"
+
 VTK_ABI_NAMESPACE_BEGIN
 vtkInstantiateTemplateMacro(template class VTKCOMMONCORE_EXPORT vtkArrayIteratorTemplate);
 template class VTKCOMMONCORE_EXPORT vtkArrayIteratorTemplate<vtkStdString>;

Common/Core/vtkGenericDataArray.cxx

@@ -22,6 +22,7 @@
 #include "vtkGenericDataArray.h"
 
 #include "vtkDataArrayPrivate.txx"
+#include "vtkOStreamWrapper.h"
 
 namespace vtkDataArrayPrivate
 {