Add missing "emit"s

Change-Id: I88a7397c7689b1e72cdd0e52077f8097443963c0
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/qmakeprojectmanager/qmakestep.cpp

@@ -532,7 +532,7 @@ QWidget *QMakeStep::createConfigWidget()
 
     qmakeBuildConfigChanged();
 
-    updateSummary();
+    emit updateSummary();
     updateAbiWidgets();
     updateEffectiveQMakeCall();