[PATCH] Implement std::advance for istreambuf_iterator using pubseekoff

[François Dumont]

The same way I proposed to review std::copy overload for 
istreambuf_iterator we can implement std::advance using pubseekoff.

It is both a cleaner implementation and avoids yet another friend 
declaration.


 Â Â Â  * include/std/streambuf
 Â Â Â  (advance(istreambuf_iterator<>&, _Distance)): Remove friend 
declaration.
 Â Â Â  * include/bits/streambuf_iterator.h (__copy_move_a2): Re-implement 
using
 Â Â Â  streambuf pubseekoff.

Tested under Linux x86_64.

Ok to commit ?

François

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