ar mishandles files bigger than 2GB

[Francois Gouget]

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.

In any case, here's the first patch in the 5 patch series fixing this 
issue. Let me know if I should also send the others here. The patches 
are also attached to the bug:

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=652887


So one of the first problems in handling files bigger than 2GB is that 
in the BFD library we use a long to write the size as a string to the 
archive element header. On a 32bit platform this results in a negative 
or truncated file size even though support for large files is enabled.

So this first patch encapsulates writing the size header field in the 
_bfd_ar_sizepad() function.

-- 
Francois Gouget <fgouget@codeweavers.com>
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