--enable-c-cpplib build is broken

[Jeffrey A Law]

  > I have a patch which I've partly completed testing on.  Let me know if
  > it works for you. 
  > 
  > 		--Kaveh
  > 
  > 
  > 
  > 
  > Tue Dec  1 12:50:13 1998  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
  > 
  > 	* c-aux-info.c (concat): Wrap function definition in !USE_CPPLIB.
  > 
  > 	* cppalloc.c: Move function `xcalloc' from cpplib.c to here.
  > 	* cpplib.c: Move function `xcalloc' from here to cppalloc.c.
I've got no objections to this patch.  So if it's OK with Dave it's OK with
me.

jeff