fix windows build

Author: jef-n

src/core/symbology-ng/qgsrendererv2registry.h

@@ -4,11 +4,11 @@
 #include <QIcon>
 #include <QMap>
 #include <QStringList>
+#include <QDomElement>
 
 #include "qgis.h"
 
 class QgsFeatureRendererV2;
-class QDomElement;
 class QgsVectorLayer;
 class QgsStyleV2;
 class QgsRendererV2Widget;