[PATCH] Use MACHINE_ARCH for boot loader

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Hi,

The attached patch changes FreeBSD/x86 back to FreeBSD/i386 on i386 and
FreeBSD/amd64 on amd64.

Comments welcome!  I'll commit it in by the weekend if there is no
objection on this.

Cheers,
- -- 
Xin LI <delphij_at_delphij.net>	http://www.delphij.net/
FreeBSD - The Power to Serve!	       Live free or die
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