[libstdc++] Partial implementation of DR 60.

[Phil Edwards]

> > >Should this go in 3.3?  *shrug*
> > 
> > I think you might as well put this in both places (you can keep the test
> > cases only in mainline if you'd prefer, since merging them can be a
> > pain.)
> 
> That sounds good.

The relevent changelog entry is

    2003-04-23  Phil Edwards  <pme@gcc.gnu.org>

        * include/bits/istream.tcc (putback, unget, sync, tellg, seekg):
        Comment and change to comply with DR 60 and the effect on gcount().
        * include/std/std_istream.h:  Update comments.



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