Project: Do not save filenames in derived classes

Change-Id: I23960c61676e96c429b59ad8f8247e1b88606b1a
Reviewed-by: Niels Weber <niels.weber@theqtcompany.com>
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -147,7 +147,6 @@ private:
     QStringList getCXXFlagsFor(const CMakeBuildTarget &buildTarget, QByteArray *cachedBuildNinja);
 
     ProjectExplorer::Target *m_activeTarget = 0;
-    Utils::FileName m_fileName;
 
     // TODO probably need a CMake specific node structure
     Internal::CMakeProjectNode *m_rootNode;