Add recently accepted blocks and txn to AttemptToEvictConnection.

This protects any not-already-protected peers who were the most
 recent four to relay transactions and most recent four to send
 blocks to us.

src/net.h

@@ -416,6 +416,11 @@ public:
 
     // Last time a "MEMPOOL" request was serviced.
     std::atomic<int64_t> timeLastMempoolReq;
+
+    // Block and TXN accept times
+    std::atomic<int64_t> nLastBlockTime;
+    std::atomic<int64_t> nLastTXTime;
+
     // Ping time measurement:
     // The pong reply we're expecting, or 0 if no pong expected.
     uint64_t nPingNonceSent;