CppTools/ProjectExplorer: Remove enum duplication

... between CppTools::ProjectPart and ProjectExplorer::ToolChain.

Change-Id: I8b448747e454adbed77547460383b8515462cc81
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/plugins/cpptools/cppprojectinfogenerator.h

@@ -49,7 +49,7 @@ private:
                                        const ProjectFiles &projectFiles,
                                        const QString &partName,
                                        Language language,
-                                       ProjectPart::LanguageExtensions languageExtensions);
+                                       ProjectExplorer::LanguageExtensions languageExtensions);
 
 private:
     const QFutureInterface<void> m_futureInterface;