make-temporary-file doesn't not make unique file under multithreading environment

[Takashi Kato]

This may creates the same file;

(import (srfi :18) (util file))
(map thread-start!
         (map (lambda (a) (make-thread (lambda () (make-temporary-file))) '(1 2 3)))

[Takashi Kato]

Fixed document format (binary io) Considering multithread environment for make-temporary-file (Fixes #81).

→ <<cset 2a4a1665c466>>