QmlDesigner: export ViewManager

Change-Id: I80df84f0dd9837282d059341c7cc08d56b18095a
Reviewed-by: Marco Bubke <marco.bubke@digia.com>

src/plugins/qmldesigner/designercore/include/viewmanager.h

@@ -50,7 +50,7 @@ namespace Internal {
     class DesignModeWidget;
 }
 
-class ViewManager
+class QMLDESIGNERCORE_EXPORT ViewManager
 {
 public:
     ViewManager();