use C++ mode in emacs

mailnews/news/src/nntpCore.h

@@ -1,4 +1,4 @@
-/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
  *
  * The contents of this file are subject to the Netscape Public License
  * Version 1.0 (the "NPL"); you may not use this file except in
@@ -211,4 +211,4 @@ HG25430
 };
 #endif
 
-#endif /* NNTPCore_H__ */
+#endif /* NNTPCore_H__ */