C++: Remove hard-coded configuration file name.

Change-Id: Ibe4cc69eafd14dab7707862b1068ce1e21b1d8e0
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cpptools/ModelManagerInterface.cpp

@@ -28,6 +28,7 @@
 ****************************************************************************/
 
 #include "ModelManagerInterface.h"
+#include "pp-engine.h"
 
 #include <QtCore/QSet>
 
@@ -35,6 +36,9 @@ using namespace CPlusPlus;
 
 static CppModelManagerInterface *g_instance = 0;
 
+const QString CppModelManagerInterface::configurationFileName()
+{ return Preprocessor::configurationFileName; }
+
 CppModelManagerInterface::CppModelManagerInterface(QObject *parent)
     : QObject(parent)
 {