NetworkPkg: Reproduce builds across source format changes

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3688

Use DEBUG_LINE_NUMBER instead of __LINE__.

Cc: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Siyuan Fu <siyuan.fu@intel.com>
Cc: Michael Kubacki <michael.kubacki@microsoft.com>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Maciej Rabeda <maciej.rabeda@linux.intel.com>
Tested-by: Michael Kubacki <michael.kubacki@microsoft.com>

NetworkPkg/Library/DxeNetLib/DxeNetLib.c

@@ -434,7 +434,7 @@ SyslogBuildPacket (
            NETDEBUG_LEVEL_TRACE,
            "Tcp",
            __FILE__,
-           __LINE__,
+           DEBUG_LINE_NUMBER,
            NetDebugASPrint ("State transit to %a\n", Name)
          )