* libc/include/machine/_default_types.h: Revert change from 2013-10-10.
	Implement malloc_stats for nano.
	* libc/stdlib/nano-mallocr.c (RONECALL): New parameter macro.
	(sbrk_start): New variable.
	(current_mallinfo, free_list): Forward declaration of data.
	(chunk): Define size as long type.
	(mallinfo): Synchronize with latest malloc.h.
	(nano_*): Forward declaration of functions.
	(get_chunk_from_ptr): Defined to static inline.
	(nano_mallinfo): Implement this function.
	(nano_malloc_stats): Implement this function.