CppModelManager: reduce number of cleanPath calls.

Instead of checking each file's full path individually we store the
cleaned version of the directory.

Change-Id: Icaa41a38d6608ba364fcb0e01cc9eb1db99470ac
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/cpptools/cppmodelmanager.h

@@ -265,6 +265,7 @@ public:
     void run(const QString &fileName);
 
     void resetEnvironment();
+    static QString cleanPath(const QString &path);
 
     const QSet<QString> &todo() const
     { return m_todo; }
@@ -305,7 +306,6 @@ private:
     CPlusPlus::Environment env;
     CPlusPlus::Preprocessor preprocess;
     QStringList m_includePaths;
-    QStringList m_systemIncludePaths;
     CPlusPlus::CppModelManagerInterface::WorkingCopy m_workingCopy;
     QStringList m_projectFiles;
     QStringList m_frameworkPaths;