Use consts instead of hardcoded values

Source/multi.cpp

@@ -460,8 +460,8 @@ void __cdecl multi_process_network_packets()
 			multi_clear_left_tbl();
 			v1 = pkt;
 			v2 = pkt;
-			if ((unsigned int)len >= 0x13
-			    && *(_DWORD *)arglist < 4u
+			if ((unsigned int)len >= sizeof(TPktHdr)
+			    && *(_DWORD *)arglist < MAX_PLRS
 			    && pkt->wCheck == 'ip'
 			    && (unsigned short)pkt->wLen == len) {
 				v3 = *(_DWORD *)arglist;

Source/nthread.cpp

@@ -116,7 +116,7 @@ int __fastcall nthread_recv_turns(int *pfSendAsync)
 	sgbPacketCountdown = byte_679704;
 	if (!hasCountedDown)
 		goto LABEL_11;
-	if (SNetReceiveTurns(0, 4, (char **)glpMsgTbl, (unsigned int *)gdwMsgLenTbl, (LPDWORD)player_state)) {
+	if (SNetReceiveTurns(0, MAX_PLRS, (char **)glpMsgTbl, (unsigned int *)gdwMsgLenTbl, (LPDWORD)player_state)) {
 		if (!byte_679758) {
 			byte_679758 = 1;
 			last_tick = GetTickCount();