startup, not time since first call to GET-INTERNAL-REAL-TIME.
* improvement: SAVE-LISP-AND-DIE explicitly checks that multiple
threads are not running after *SAVE-HOOKS* have run.
+ * improvement: floating-point exception handling should work on all
+ POSIX platforms (thanks to NIIMI Satoshi)
* bug fix: compiler bug triggered by a (non-standard) VALUES
declaration in a LET* was fixed. (reported by Kaersten Poeck)
* bug fix: file compiler no longer confuses validated and already