bring back 5718/5719/5720 support again. deraadt pointed out that

the problems i had on the xserve g5 are mostly likely specific to
that machine and im inclined to agree. we're going to see a lot
more machines with the new chips than people with xserve g5s.

this also includes fixes for ip checksum handling compared to the
code i put in before.

tested by various people again.
sthen@ and claudio@ have agreed to babysit this. they can back it
out if im not around.
ok deraadt@

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