Remove triangles from windmills in Windmill.ocs.

planet/Arena.ocf/Windmill.ocs/System.ocg/SensitiveWindGenerator.c

@@ -6,4 +6,7 @@ func Damage()
 }
 
 // No lightbulbs
-func MakePowerProducer(power) { return false; }
+func MakePowerProducer(power) { return false; }
+
+//No triangles
+func RedrawFlagRadius() { return; }