fix build error on windows

git-svn-id: http://svn.osgeo.org/qgis/trunk/qgis@12253 c8812cc2-4d05-0410-92ff-de0c093fc19c

src/core/composer/qgscomposerarrow.cpp

@@ -87,7 +87,7 @@ void QgsComposerArrow::paint( QPainter* painter, const QStyleOptionGraphicsItem*
   }
 }
 
-void QgsComposerArrow::QgsComposerArrow::setSceneRect( const QRectF& rectangle )
+void QgsComposerArrow::setSceneRect( const QRectF& rectangle )
 {
   //maintain the relative position of start and stop point in the rectangle
   double startPointXPos = ( mStartPoint.x() - transform().dx() ) / rect().width();

src/core/composer/qgscomposerarrow.h

@@ -21,7 +21,7 @@
 #include "qgscomposeritem.h"
 
 /**An item that draws an arrow between to points*/
-class QgsComposerArrow: public QgsComposerItem
+class CORE_EXPORT QgsComposerArrow: public QgsComposerItem
 {
   public:
     QgsComposerArrow( QgsComposition* c );