message: buildenv: Fix infinite loop.
diff: @@ -331,7 +331,8 @@ class State:
  pass
  max_age = datetime.timedelta(days = 7)
  clean_older(max_age)
  - while self.disk_space() < self.__opts.cleanup_threshold:
  + while self.disk_space() < self.__opts.cleanup_threshold and \
  + max_age >= datetime.timedelta(days = 3):
  max_age -= datetime.timedelta(days = 1)
  clean_older(max_age)
  return {
  