[MLton] starting builds

[Stephen Weeks]

> > There seems to be some hppa funkiness with reals.
> > However, I think it was the same before.
> 
> Normally we don't worry too much about the low bits in the real
> regression.  But in this case, the failure is the section
> 
>   Testing copySign, sameSign, sign, signBit
> 
> Once Fail "bug" is raised there, the test terminates and we don't even
> get to compare the rest.

I committed a fix to Real<N>.signBit that is likely to fix this bug.
If you could please rerun the regressions at some point (after looking
into the testdyn1 bug) that would be great.