flush output ports to avoid confusing tests output

svn: r12201

collects/tests/run-automated-tests.ss

@@ -50,6 +50,8 @@
   (define name (cadr t))
   (define stderr (current-error-port))
   (define (echo fmt . args)
+    (flush (current-output-port))
+    (flush (current-error-port))
     (fprintf stderr ">>> ~a: ~a\n" name (apply format fmt args)))
   (newline stderr)
   (echo "running...")