big patch, Aix 5, binutils emulation, aix 64 bit shared library.

[Nick Clifton]

Hi Tom,

> This patch has 3 major parts.
> 
> 1. AIX 5.1
> 2. 64 bit AIX shared libraries.
> 3.  binutils emulation layer.

> Comments?

I have checked this patch in.  I made a few formatting fixes but
otherwise left the code alone.

Cheers
        Nick