CMake: Export internal cmake cache values

Those are useful for the cmake internal classes, but need to be filtered
out when they are going to get displayed to the users.

Change-Id: I0bb62fa840fa8cb9e6f3b47300ba85a2b186bad0
Reviewed-by: Alexander Drozdov <adrozdoff@gmail.com>
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>

src/plugins/cmakeprojectmanager/builddirmanager.h

@@ -88,7 +88,6 @@ public:
     CMakeConfig parsedConfiguration() const;
 
     static CMakeConfig parseConfiguration(const Utils::FileName &cacheFile,
-                                          const Utils::FileName &sourceDir,
                                           QString *errorMessage);
 
 signals: