ipip: refactor ipip.api with explicit types

Use explicit types vl_api_address/prefix in ipip.api.

Change-Id: Ib3133cebdbe4437742924efd49cde4009c4cc31b
Type: refactor
Signed-off-by: Ole Troan <ot@cisco.com>
diff --git a/src/tools/vppapigen/vppapigen_c.py b/src/tools/vppapigen/vppapigen_c.py
index 6c4ca35..b34d063 100644
--- a/src/tools/vppapigen/vppapigen_c.py
+++ b/src/tools/vppapigen/vppapigen_c.py
@@ -13,6 +13,7 @@
  * Automatically generated: please edit the input file NOT this file!
  */
 
+#include <stdbool.h>
 #if defined(vl_msg_id)||defined(vl_union_id) \\
     || defined(vl_printfun) ||defined(vl_endianfun) \\
     || defined(vl_api_version)||defined(vl_typedefs) \\