Patch for format checking tree nodes in C++

[Jeffrey A Law]

  In message <Pine.LNX.4.21.0010091809390.24212-100000@kern.srcf.societies.cam.
ac.uk>you write:
  > This patch makes the C++ compiler create those type nodes used only
  > for format checking that were previously only created in the C
  > compiler.
  > 
  > Bootstrapped with no regressions on i686-pc-linux-gnu.  OK to commit?
  > 
  > 2000-10-09  Joseph S. Myers  <jsm28@cam.ac.uk>
  > 
  > 	* decl.c (WINT_TYPE): Define.
  > 	(init_decl_processing): Create types unsigned_ptrdiff_type_node,
  > 	c_size_type_node, signed_size_type_node and wint_type_node.
Approved.  Please install if you haven't done so already.

THanks,
jeff