[MLton] Port of OpenBSD to MLton

[Jesper Louis Andersen]

Quoting Stephen Weeks (sweeks@sweeks.com):
  
> This should run the Linux-emulated MLton to build the .o files and
> link them with the OpenBSD-compiled runtime to produce a native
> OpenBSD MLton.

It was more or less the idea I had originally and with your help
for the makefile targets I managed to get a version bootstrapped.
It is happily chewing off on the regression framework now. When
I have seen that work, I'll provide patches as well as the base
version for the bootstrap.

-- 
j.