Fix Lines.polyline when only two points are provided

arc-core/src/arc/graphics/g2d/Lines.java

@@ -152,6 +152,10 @@ public static void polyline(FloatSeq points, boolean wrap){
     //implementation taken from https://github.com/earlygrey/shapedrawer/blob/master/drawer/src/space/earlygrey/shapedrawer/ShapeDrawer.java
     public static void polyline(float[] points, int length, boolean wrap){
         if(length < 4) return;
+        if(length == 4){ //line is faster and this method doesn't even work correctly with 2 items
+            line(points[0], points[1], points[2], points[3]);
+            return;
+        }
 
         float halfWidth = 0.5f * stroke;