tcp: migrate old MULTIARCH macros to VLIB_NODE_FN

Change-Id: Ifd9fa30eed343e2c5d40582b3e3aa589b070637d
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
diff --git a/src/vnet/CMakeLists.txt b/src/vnet/CMakeLists.txt
index 9e3e5d1..f308f72 100644
--- a/src/vnet/CMakeLists.txt
+++ b/src/vnet/CMakeLists.txt
@@ -569,6 +569,12 @@
   tcp/tcp.c
 )
 
+list(APPEND VNET_MULTIARCH_SOURCES
+  tcp/tcp_input.c
+  tcp/tcp_output.c
+  tcp/tcp_syn_filter4.c
+)
+
 list(APPEND VNET_HEADERS
   tcp/tcp_packet.h
   tcp/tcp_timer.h