Force compilers to generate vtable for QgsRendererV2Metadata

Fix #8646
Fix #5170
Explanation see: http://trac.osgeo.org/geos/ticket/535#comment:11

Author: mbernasocchi

src/core/symbology-ng/qgsrendererv2registry.cpp

@@ -88,6 +88,8 @@ QgsRendererV2AbstractMetadata* QgsRendererV2Registry::rendererMetadata( QString
   return mRenderers.value( rendererName );
 }
 
+QgsRendererV2Metadata::~QgsRendererV2Metadata(){}
+
 QStringList QgsRendererV2Registry::renderersList()
 {
   return mRenderersOrder;

src/core/symbology-ng/qgsrendererv2registry.h

@@ -103,6 +103,8 @@ class CORE_EXPORT QgsRendererV2Metadata : public QgsRendererV2AbstractMetadata
         , mCreateFromSldFunc( pfCreateFromSld )
     {}
 
+    virtual ~QgsRendererV2Metadata();
+
     virtual QgsFeatureRendererV2* createRenderer( QDomElement& elem ) { return mCreateFunc ? mCreateFunc( elem ) : NULL; }
     virtual QgsRendererV2Widget* createRendererWidget( QgsVectorLayer* layer, QgsStyleV2* style, QgsFeatureRendererV2* renderer )
     { return mWidgetFunc ? mWidgetFunc( layer, style, renderer ) : NULL; }