Move to a new build infastructure

Now rather than building everything with pconfigure I have an external
build script and store the results.  This is both good and bad:
specifically, it's got the problem of checking in binaries, but it
should actually work everywhere.

I'm OK with the binaries because this repo doesn't actually do
anything...
Add an update script

This script simply updates the committed binaries.
(bin) Build Chisel 333bb95fd6e2780d6f3629699497953e333ef001