[MLton] CVS build fails - solution

[Stephen Weeks]

> I just noticed that "make clean" actually deletes the mlton/cm directory!!

I believe this is a Windows case-insensitivity problem.  mlton/cm is
definitely needed.  The problem is in the bin/clean script, which
removes "CM" directories, which used to be created by SML/NJ's CM.
But since they aren't any longer (we now use 110.44) I've taken out
the line.  Hopefully you can CVS update to get the cm directory and
then rebuild.