Add explicit lint-comment-style fallthrough annotations. GCC now assumes that if you don't have these you're making a mistake, which is annoying. XXX: This changeset updates the AG output files only (by hand) and is XXX: abusive - rebuilding them will erase the change. However, I need XXX: to get things to build before I can try to get AG to issue the XXX: annotations itself, so this seems like a reasonable expedient.

#define AAA <includes.h>
#define BBB "includes.h"
#define CCC(x) "includes.h"
#define DDD(x) #x

#include AAA
#include BBB
#include CCC(1)
#include CCC(includes.h)

#define includes wrong
#include "includes.h"
#include <includes.h>