Remove export macro from models

It's not needed and breaks linking on Windows

src/incidencetreemodel.h

@@ -21,7 +21,7 @@
 
 class IncidenceTreeModelPrivate;
 
-class EVENTVIEWS_EXPORT IncidenceTreeModel : public QAbstractProxyModel
+class IncidenceTreeModel : public QAbstractProxyModel
 {
     Q_OBJECT
 public:

src/todomodel.h

@@ -29,7 +29,7 @@ class QMimeData;
 
 class TodoModelPrivate;
 
-class EVENTVIEWS_EXPORT TodoModel : public QAbstractProxyModel
+class TodoModel : public QAbstractProxyModel
 {
     Q_OBJECT