ImageView: Suppress a warning if SVG is not available

Change-Id: Ic61c61ec9f9c80c930c361e71c4d4b374aa39906
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>

src/plugins/imageviewer/imageview.cpp

@@ -188,11 +188,13 @@ bool ImageView::exportSvg(const ExportData &ed)
     return result;
 }
 
+#ifndef QT_NO_SVG
 static QString suggestedExportFileName(const QFileInfo &fi)
 {
     return fi.absolutePath() + QLatin1Char('/') + fi.baseName()
         + QStringLiteral(".png");
 }
+#endif
 
 QSize ImageView::svgSize() const
 {