--enable-c-cpplib build is broken

[Jeffrey A Law]

  In message <3663153C.75626B27@cygnus.com>you write:
  > Kaveh,
  > 
  > It looks like this change broke the --enable-c-cpplib build. Looks
  > like you forgot to remove some libiberty stuff from cpplib.c, prefix.c
  > and cppalloc.c (breaks cc1), then when I do this cc1plus needs
  > libiberty.
  > 
  > At this point I think I'll just get you to look at it.
It helps a lot if you say more precisely how it broke.  Did cc1 or cc1plus
not link?  If so, what symbols were undefined?  Or was the breakage more
subtle?

jeff