It turns out the other port wasn't actually sufficient to do anything
with the strace port, it was just enough to get a RISC-V port built
with no actual support.

This at least allows the RISC-V code to build, but I believe it won't
work (though I'm going to actually try that in a minute).  Aside from
the syscall list, this is pretty much just Intel code, so I think this
should be the right way to go.

Updates to 4.8