Blockchain: match original function declaration from blockchain_storage

src/cryptonote_core/blockchain.cpp

@@ -2288,7 +2288,7 @@ bool Blockchain::add_new_block(const block& bl_, block_verification_context& bvc
   return handle_block_to_main_chain(bl, id, bvc);
 }
 //------------------------------------------------------------------
-void Blockchain::check_against_checkpoints(checkpoints& points, bool enforce)
+void Blockchain::check_against_checkpoints(const checkpoints& points, bool enforce)
 {
   const auto& pts = points.get_points();
 

src/cryptonote_core/blockchain.h

@@ -141,7 +141,7 @@ namespace cryptonote
     void print_blockchain_index();
     void print_blockchain_outs(const std::string& file);
 
-    void check_against_checkpoints(checkpoints& points, bool enforce);
+    void check_against_checkpoints(const checkpoints& points, bool enforce);
     void set_enforce_dns_checkpoints(bool enforce);
     bool update_checkpoints(const std::string& file_path, bool check_dns);