Two minor patches for egcs-19971122

[Joe Buck]

> How about stringstream & sstream?  The C++ 3.0 book seems a little bit 
> confusing to me.  At page 119 it says that in order to use
> istringstream you have to include <stringstream>.  Later, at page 641,
> there is an example where <sstream> is used for the same purpose.

The correct header name is <sstream> (I guess you are talking about
Stroustrup's new book -- early printings were full of minor errors like
this: to be fair I think it was originally going to be <stringstream>
but the name was shortened).

> None of these is included with egcs.

Yes, I believe that Dietmar Kuehl has donated a version of stringstream;
I don't know its status.