egcs-970828: Some nits

[Joe Buck]

> On the other hand, if you don't keep all three directories around, it
> can make it mightly hard to debug when things go wrong.  I find
> bootstrapping with -save-temps helps even more (again at a cost in disk
> space).  Every thing in life is a tradeoff.

Developers often have lots of space, but end users are often very short
of disk space (Linux folk especially).  When we ship, bootstrapping should
just work.

To satisfy both types of users, there could be two targets or an option
to conserve disk space.