[Distutils] [issue1] amd64 eggs are called x86_64

[Mark Hammond]

> Currently eggs created for amd64 platforms are called x86_64 in the egg
> filename. AMD renamed x86_64 to amd64 and asked people to follow suit.
> Also Python uses the amd64 nomenclature:
> http://mail.python.org/pipermail/python-bugs-list/2006-
> December/036400.html and
> http://mail.python.org/pipermail/python-dev/2008-May/079056.html
> 
> As such, to limit end-user confusion eggs should be named amd64 as well
> instead of x86_64.

Note that "win-" should probably be in the filename too.  eg, the py 2.6
trunk building pywin32 will create a filename
'pywin32-210.9.win-amd64-py2.6.exe'

Cheers,

Mark