Fix GCC missing object error

src/extractor/restriction_graph.cpp

@@ -117,7 +117,7 @@ struct transferBuilder
 
     void start(NodeID from, NodeID to) { cur_node = getOrInsertStartNode(rg, from, to); }
 
-    void _suffixes_next(NodeID from, NodeID to)
+    void next_suffixes(NodeID from, NodeID to)
     {
         // Update the suffix paths to include those that also have this edge
         auto new_suffix_it = suffix_nodes.begin();
@@ -144,7 +144,7 @@ struct transferBuilder
 
     // For each edge on path, if there is an edge in the suffix path not on the current
     // path, add as a transfer.
-    void _add_suffix_transfer(const RestrictionID &suffix_node)
+    void add_suffix_transfer(const RestrictionID &suffix_node)
     {
         for (const auto &suffix_edge : rg.GetEdges(suffix_node))
         {
@@ -185,10 +185,10 @@ struct transferBuilder
         // We know this edge exists
         cur_node = next_edge_itr->target;
 
-        _suffixes_next(from, to);
+        this->next_suffixes(from, to);
 
         std::for_each(suffix_nodes.begin(), suffix_nodes.end(), [&](const auto &suffix_node) {
-            _add_suffix_transfer(suffix_node);
+            this->add_suffix_transfer(suffix_node);
         });
 
         for (const auto &suffix_node : suffix_nodes)