3.2 PATCH: Fully support parallel gnat1/gnatbind builds

[Robert Dewar]

> Suppose you have an emulator that is extremely portable, and has enough  
> support to run gcc, and configure, and make, and whatever else is needed.  
> (Maybe even one of the existing emulators qualifies?) And hopefully, it's  
> also not extremely slow.

Perhaps you could use MMIX for this .. 

By the way at least 7 of the students in my class (some still have
incompletes) finished the assignment of creating a self hosted
bootstrapped Algol-68 subset compiler for MMIX :-)