itimer moved to syscalls but is implemented via rts/events.scm

scsh/syscalls.scm

@@ -612,7 +612,8 @@
 		       (else (error "Illegal proc passed to signal-process-group"
                                     proc-group))))
               signal))
-
+(define (itimer sec)
+  ((structure-ref events schedule-timer-interrupt!) (* sec 1000)))
 ;;; SunOS, not POSIX:
 ;;; (define-foreign signal-process-group/errno
 ;;;   (killpg (integer proc-group) (integer signal))