misc: Break the big IP header files to improve compile time

Type: refactor

Signed-off-by: Neale Ranns <neale.ranns@cisco.com>
Change-Id: Id1801519638a9b97175847d7ed58824fb83433d6
diff --git a/src/vnet/ip/ip4_forward.h b/src/vnet/ip/ip4_forward.h
index 1750ac6..8779d2d 100644
--- a/src/vnet/ip/ip4_forward.h
+++ b/src/vnet/ip/ip4_forward.h
@@ -43,6 +43,7 @@
 #include <vppinfra/cache.h>
 #include <vnet/fib/ip4_fib.h>
 #include <vnet/dpo/load_balance_map.h>
+#include <vnet/ip/ip4_inlines.h>
 
 /**
  * @file