building grub on AMD64

[Stefan Reinauer]

Hi,

with the attached patch grub2 can be built on AMD64 systems. 
It is not completely clean I would say, but it solves the problem with
minimum impact. 
Please dont tare my head off ;-) 

It is necessary to call autoconf before the code can be used.

Since Linux and other 64bit operating systems switch to long mode
themselfes, it is not needed to have grub2 64bit. It can/should stay
32bit for now, unless someone is willing to properly do a lot of cleanup
work in Linux and other places.

Comments welcome

Regards,
Stefan

grub2-amd64.diff
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