Merge pull request #4450

0da6b3f Remove signal DoubleSpendDetected, use function (Tom Harding)
88dd359 Check signatures before respend relay (Tom Harding)

src/init.cpp

@@ -1183,7 +1183,7 @@ bool AppInit2(boost::thread_group& threadGroup)
     LogPrintf("mapAddressBook.size() = %u\n",  pwalletMain ? pwalletMain->mapAddressBook.size() : 0);
 #endif
 
-    RegisterInternalSignals();
+    InitRespendFilter();
     StartNode(threadGroup);
     if (fServer)
         StartRPCThreads();