AMD64-patch for buildworld

["Noah yan" <noah.yan@xxxxxxxxx>]

Simon,

patch attached, totally 6. please apply them in order. commit message
is in tar ball.

for those who are interested: the buildworld cross-build completes
with this patches and i am working on the cross-buildkernel. a slow,
but still a progress :).

yonghong

Attachment: amd64patch.tar
Description: Unix tar archive