* callback.h (CB_TARGET_DEFS_MAP): Renamed from target_defs_map.

	* callback.h (CB_TARGET_DEFS_MAP): Renamed from target_defs_map.
	(host_callback): Add stat, fstat, syscall_map, errno_map, open_map,
	signal_map, stat_map.
	(errn_map,open_map): Renamed to cb_init_foo_map.
	(cb_host_to_target_errno,cb_target_to_host_open): Renamed from
	host_to_target_errno,target_to_host_open.
	(cb_read_target_syscall_maps): Add prototype.
	(cb_target_to_host_syscall): Likewise.
	(cb_host_to_target_stat): Likewise.
	(cb_syscall): Likewise.
	(CB_SYS_{exit,open,close,read,write,lseek,unlink,getpid,kill,fstat,
	argvlen,argv,chdir,stat,chmod,utime,time}): Define.
	(CB_SYSCALL): New type.
	(CB_RC): New enum.