[MLton] Cross compile on ARM successful

[Ryan Newton]

I cross compiled the MLton runtime for ARM-linux and it's currently  
running fine on some embedded devices.  It was a bit tough because I  
had to manually go through and do the steps in "add-cross" (the  
embedded machines don't have gcc!) and I had to apply a few hacks to  
the code, but it works fine.

By the way, are there any incantations that can turn off all  
optimizations in the compiler and simply maximize compilation speed?   
Maybe most people simply use SML/nj for prototyping, but I'm now  
dependent on the MLton FFI...

Thanks,
-Ryan