[xproto: PATCH] Xmd.h: amd64-x32 ABI defines sizeof(long) == sizeof (void*) == 4

[Mark Kettenis]

> Date: Tue, 20 Dec 2011 08:41:44 -0800
> From: Alan Coopersmith <alan.coopersmith at oracle.com>
> 
> Are you sure that every real amd64 platform that uses __amd64__
> defines __LP64__ as well?

Not sure if you'd call 64-bit Windows a real amd64 platform, but given
that Microsoft made the brilliant decision to use the LLP64 mode, it
certainly won't define __LP64__.