Fixing Perl unit tests

src/libslic3r/Layer.hpp

@@ -148,6 +148,8 @@ public:
         return false;
     }
     void                    make_perimeters();
+    // Phony version of make_fills() without parameters for Perl integration only.
+    void                    make_fills() { this->make_fills(nullptr, nullptr); }
     void                    make_fills(FillAdaptive::Octree* adaptive_fill_octree, FillAdaptive::Octree* support_fill_octree);
     void 					make_ironing();