fix build

Author: andiwand

src/odr/document_element.hpp

@@ -7,7 +7,7 @@
 #include <odr/definitions.hpp>
 
 namespace odr {
-class TablePosition;
+struct TablePosition;
 struct TableDimensions;
 class DocumentPath;
 class File;

src/odr/internal/abstract/document.hpp

@@ -13,7 +13,7 @@ enum class ValueType;
 enum class AnchorType;
 struct PageLayout;
 struct TableDimensions;
-class TablePosition;
+struct TablePosition;
 struct TableStyle;
 struct TableColumnStyle;
 struct TableRowStyle;