[RFA] sync include/ansidecl.h with GCC

[Mark Kettenis]

   Date: Fri, 16 Jun 2000 16:41:44 -0700
   From: Nick Clifton <nickc@cygnus.com>

   Hi Mark,

   : 2000-05-06  Zack Weinberg  <zack@wolery.cumb.org>
   : 
   :         * ansidecl.h: #define __extension__ to nothing if
   :         GCC_VERSION < 2008.

   Approved.

Looks like HJ beat me to it.  Thanks anyway.

Mark