20000131 anomolous system header warnings

[Jeffrey A Law]

  In message < Pine.LNX.4.10.10002071713320.12651-100000@balti.cygnus.co.uk >you 
write:
  > Still, any place that uses TREE_PERMANENT (or any other means of
  > determining which obstack a given node is on) is broken if we want to
  > remove obstack code from frontends that have been converted to gc.
  >  Eliminating such uses is a good idea.
Agreed.  My point was that we can't simply zap all the obstack code now
or even in the near future.

jeff