0.8.4.5:

0.8.4.5:
	Make simple-streams work on alpha
	... really ensure the various ffi_foo_t types for wrapped_stat
		are 32-bit everywhere
	... update the lisp version of the struct definition to believe
		this, too (UNSIGNED-INT, not UNSIGNED-LONG)
	... also bugfix: MOST-POSITIVE-FIXNUM is an upper exclusive bound
	... stray arch_os_get_current_thread() fix