[Patch] Move pback members from basic_streambuf to basic_filebuf

[Andreas Tobler]

Paolo Carlini wrote:
> Andreas Tobler wrote:
> 
>> Well, there are some failures though.
> 
> 
> Sorry :-((((((( It's just one instantiation not two!
> 
> A long day of work...
> 
> Wait just an hour and I will come back with the real fix.

Ok, mine was/is also long ;)

I'll have a short break and test when I'm back.

In the menatime I run the test with the back inserted line on the 
failing tests.
std::basic_filebuf<gnu_char_type>::_S_pback_size;

Thanks!!

Andreas