CppEditor: Follow Symbol Under Cursor opens the preprocessor dialog

... when invoked on a macro that is defined inside that dialog.

Change-Id: I419c6675d70cfb8dd174f6a33f502b4c584baa3a
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/cpptools/cppmodelmanagerinterface.h

@@ -216,6 +216,7 @@ public:
 
 public:
     static const QString configurationFileName();
+    static const QString editorConfigurationFileName();
 
 public:
     CppModelManagerInterface(QObject *parent = 0);