[v3] Undo 2001-11-30 libsupc++ changes

[Paolo Carlini]

Jason Merrill wrote:

> Thanks.  But Benjamin suggested adding comments to explain why these
> seemingly-useless declarations are there, which makes sense to me.  Perhaps
> just "this declaration is not useless" and a reference to the URL Nathan
> mentioned.

Ah! I did'nt understand that he meant *in the code* (vs, in the ChangeLog)

I will do, sorry.

Paolo.