Updated box2d from 2.2.1 to 2.3.0

--HG--
branch : box2d-2.3

src/modules/physics/box2d/PolygonShape.cpp

@@ -57,6 +57,12 @@ int PolygonShape::getPoints(lua_State *L)
 	return count*2;
 }
 
+bool PolygonShape::validate() const
+{
+	b2PolygonShape *p = (b2PolygonShape *)shape;
+	return p->Validate();
+}
+
 } // box2d
 } // physics
 } // love