* system.h: Include symcat.h.
	(STRINGIFY): Don't define.

	* configure.in: Adjust comment.

	* builtins.c: Use STRINGX, not STRINGIFY.
	* gencheck.c: Likewise.
	* gengenrtl.c: Likewise.
	* protoize.c: Likewise.

	* cpplex.c: Don't include symcat.h.
	* cpplib.c: Likewise.

	* gansidecl.h (HAVE_STRINGIZE): Don't define.

From-SVN: r40875