Raise chunk size to max packet size for network configs. Chunking breaks really ancient clients, so this helps them live a little longer. No real downside for new clients.

node/Node.cpp

@@ -592,7 +592,7 @@ void Node::ncSendConfig(uint64_t nwid,uint64_t requestPacketId,const Address &de
 				const unsigned int totalSize = dconf->sizeBytes();
 				unsigned int chunkIndex = 0;
 				while (chunkIndex < totalSize) {
-					const unsigned int chunkLen = std::min(totalSize - chunkIndex,(unsigned int)(ZT_UDP_DEFAULT_PAYLOAD_MTU - (ZT_PACKET_IDX_PAYLOAD + 256)));
+					const unsigned int chunkLen = std::min(totalSize - chunkIndex,(unsigned int)(ZT_PROTO_MAX_PACKET_LENGTH - (ZT_PACKET_IDX_PAYLOAD + 256)));
 					Packet outp(destination,RR->identity.address(),(requestPacketId) ? Packet::VERB_OK : Packet::VERB_NETWORK_CONFIG);
 					if (requestPacketId) {
 						outp.append((unsigned char)Packet::VERB_NETWORK_CONFIG_REQUEST);