Remove coinbase-dependant transactions during reorg.

This still leaves transactions in mempool that are potentially
invalid if the maturity period has been reorged out of, but at
least they're not missing inputs entirely.

src/main.cpp

@@ -1892,9 +1892,8 @@ bool static DisconnectTip(CValidationState &state) {
         // ignore validation errors in resurrected transactions
         list<CTransaction> removed;
         CValidationState stateDummy;
-        if (!tx.IsCoinBase())
+        if (tx.IsCoinBase() || !AcceptToMemoryPool(mempool, stateDummy, tx, false, NULL))
-            if (!AcceptToMemoryPool(mempool, stateDummy, tx, false, NULL))
+            mempool.remove(tx, removed, true);
-                mempool.remove(tx, removed, true);
     }
     mempool.check(pcoinsTip);
     // Update chainActive and related variables.