egcs-970929: Small changes to bootstrap handling.

[Jeffrey A Law]

  In message < 199710051538.RAA00716@saturn.s-direktnet.de >you write:
  > Hi there,
  > 
  > the recent introduction  of the new bootstrap*-lean   goals was a  big
  > ease  for  building more  compilers in   parallel. But,  I  don't like
  > duplicating   nearly identical stuff; my patch    uses the make target
  > macro "$@" to avoid this duplication.
  > 
  > In addition,  it introduces one more bootstrap4  target if  the stage3
  > compiler isn't enough.
  > 
  > Sun Oct  5 17:29:00 1997  Manfred Hollstein  (manfred@s-direktnet.de)
  > 
  > 	* Makefile.in (bootstrap-lean): Combined with `normal' bootstrap
  > 	targets using "$@" to provide support for similar but not identical
  > 	targets without having to duplicate code.
  > 
  > 	* gcc/Makefile.in (bootstrap-lean): Combined with `normal' bootstrap
  > 	targets using "$@" to provide support for similar but not identical
  > 	targets without having to duplicate code.
  > 	(bootstrap4): New goal.
I *thought* I'd remembered seeing a patch from you which
cleaned this stuff up.  Finally found it.  Thanks!

jeff