Sprinkle override over ProjectConfigurations

Change-Id: I4470b28184ce67e11ac5921b481db63cc26144c4
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

plugins/clangstaticanalyzer/clangstaticanalyzertool.cpp

@@ -63,7 +63,7 @@ public:
     }
 
 private:
-    QWidget *createConfigurationWidget() { return 0; }
+    QWidget *createConfigurationWidget() override { return 0; }
 };
 
 ClangStaticAnalyzerTool::ClangStaticAnalyzerTool(QObject *parent)