cpplex.c (ON_REST_ARG): Check VAR_ARGS flag of current context, use posn - 1 to index into tokens array.

	* cpplex.c (ON_REST_ARG): Check VAR_ARGS flag of current context,
	use posn - 1 to index into tokens array.
	(maybe_paste_with_next): Adjust caller.

	* gcc.dg/cpp/paste8.c: New test.

From-SVN: r36128