Problem with new "make bootstrap"

[Richard Kenner]

Once it finishes, it never realizes that files have changed.  So it's
not like the old "make bootstrap3" where it would do any needed recompiles.
You now have to remove stage_e, which is very counterintuitive.  Unless
some more automation can be added to allow the normal kinds of things we
need to do to be done without removing mysteriously-named files, I'd suggest
this change be reverted: the confusion isn't worth the improvement.