ipip: migrate old MULTIARCH macros to VLIB_NODE_FN

Change-Id: I9c05225b71b60dc2b419a96daeb71d89757aef98
Signed-off-by: Filip Tehlar <ftehlar@cisco.com>
diff --git a/src/vnet/CMakeLists.txt b/src/vnet/CMakeLists.txt
index 04fd6d1..77cba7b 100644
--- a/src/vnet/CMakeLists.txt
+++ b/src/vnet/CMakeLists.txt
@@ -643,6 +643,10 @@
   ipip/ipip_cli.c
 )
 
+list(APPEND VNET_MULTIARCH_SOURCES
+  ipip/node.c
+)
+
 list(APPEND VNET_HEADERS
   ipip/ipip.h
 )