* cleanups.h (struct cleanup): Move to cleanups.c.

	* cleanups.h (struct cleanup): Move to cleanups.c.
	(make_cleanup_dtor_ftype): New typedef.
	(make_cleanup_dtor): Use it.
	(ALL_CLEANUPS): Replace with ...
	(all_cleanups): ... this.  Declare.  All uses updated.
	* cleanups.c: #include "gdb_assert.h".
	(sentinel_cleanup): New static global.
	(SENTINEL_CLEANUP): Define.
	(cleanup_chain, final_cleanup_chain): Initialize to SENTINEL_CLEANUP.
	(make_my_cleanup2): Assert result is non-NULL.
	(all_cleanups): New function.
	(save_my_cleanups): Initialize new chain to SENTINEL_CLEANUP instead
	of NULL.