legacymode: Mark old netsplit extension legacy, fix magic number

engine/client/cl_main.c

@@ -1038,8 +1038,8 @@ void CL_SendConnectPacket( void )
 		Info_SetValueForKey( protinfo, "a", Q_buildarch(), sizeof( protinfo ) );
 		Info_SetValueForKey( protinfo, "i", ID_GetMD5(), sizeof( protinfo ) );
 
-		Netchan_OutOfBandPrint( NS_CLIENT, adr, "connect %i %i %i \"%s\" 2 \"%s\"\n",
+		Netchan_OutOfBandPrint( NS_CLIENT, adr, "connect %i %i %i \"%s\" %d \"%s\"\n",
-			PROTOCOL_LEGACY_VERSION, Q_atoi( qport ), cls.challenge, cls.userinfo, protinfo );
+			PROTOCOL_LEGACY_VERSION, Q_atoi( qport ), cls.challenge, cls.userinfo, NET_LEGACY_EXT_SPLIT, protinfo );
 		Con_Printf( "Trying to connect by legacy protocol\n" );
 	}
 	else
@@ -1392,7 +1392,7 @@ void CL_Reconnect( qboolean setup_netchan )
 		{
 			unsigned int extensions = Q_atoi( Cmd_Argv( 1 ) );
 
-			if( extensions & NET_EXT_SPLIT )
+			if( extensions & NET_LEGACY_EXT_SPLIT )
 			{
 				// only enable incoming split for legacy mode
 				cls.netchan.split = true;

engine/common/netchan.h

@@ -84,7 +84,7 @@ GNU General Public License for more details.
 #define NUM_PACKET_ENTITIES		256	// 170 Mb for multiplayer with 32 players
 #define MAX_CUSTOM_BASELINES		64
 
-#define NET_EXT_SPLIT		(1U<<1)
+#define NET_LEGACY_EXT_SPLIT		(1U<<1)
 #define NETSPLIT_BACKUP 8
 #define NETSPLIT_BACKUP_MASK (NETSPLIT_BACKUP - 1)
 #define NETSPLIT_HEADER_SIZE 18