If arc_c_max is already set via slconfig, don't guess any more.
If arc_c_max is already set via slconfig, don't guess any more.

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable