Eliminate libnest2d warning on mac

src/libnest2d/include/libnest2d/nester.hpp

@@ -836,7 +836,7 @@ public:
     inline ItemIteratorOnly<It, size_t> execute(It from, It to)
     {
         auto infl = static_cast<Coord>(std::ceil(min_obj_distance_/2.0));
-        if(infl > 0) std::for_each(from, to, [this, infl](Item& item) {
+        if(infl > 0) std::for_each(from, to, [infl](Item& item) {
             item.inflate(infl);
         });