CppEditor: Remove unneeded member.

Change-Id: Icc2b2705a587482ac2a4215d05a012c4c15f6439
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cppeditor/cppeditor.h

@@ -260,7 +260,6 @@ private:
     CppTools::CommentsSettings m_commentsSettings;
 
     QScopedPointer<FollowSymbolUnderCursor> m_followSymbolUnderCursor;
-    QString m_preProcessorAdditions;
     QToolButton *m_preprocessorButton;
 };