added code to skip user TXs in v5 when filling block template

src/cryptonote_core/tx_pool.cpp

@@ -1662,6 +1662,14 @@ namespace cryptonote
         continue;
       }
 
+      // HERE BE DRAGONS!!!
+      // SRCG: skip all user TXs for HF 5 - when the node restarts, it'll discard them fully in `tx_memory_pool::validate()`
+      if (version == HF_VERSION_SHUTDOWN_USER_TXS) {
+        LOG_PRINT_L2("  User TXs forbidden by consensus for HF 5 - skipping");
+        continue;
+      }
+      // LAND AHOY!!!
+      
       LOG_PRINT_L2("Considering " << sorted_it->second << ", weight " << meta.weight << ", current block weight " << total_weight << "/" << max_total_weight << ", current coinbase " << print_money(best_coinbase) << ", relay method " << (unsigned)meta.get_relay_method());
 
       if (!meta.matches(relay_category::legacy) && !(m_mine_stem_txes && meta.get_relay_method() == relay_method::stem))