ar mishandles files bigger than 2GB

[nick clifton]

Hi Francois,

> I created a bug concerning this issue (#652887) but my understanding is
> that patches should be sent here for discussion and to get them applied.
> I apologize if I'm mistaken.

Not, that is correct.


>     bfd: Fix writing the size of 2+GB elements in the archive.

Approved - please apply - but, please could you create a slightly more 
verbose ChangeLog entry.  Ie mention the files affected and the changes 
made to each file.

Cheers
   Nick