rib: add C++ include guard

All include files should be safe from C++

Fixes: 5a5793a5ff ("rib: add RIB library")
Fixes: f7e861e21c ("rib: support IPv6")
Cc: stable@dpdk.org

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Vladimir Medvedkin <vladimir.medvedkin@intel.com>

lib/librte_rib/rte_rib.h

@@ -20,6 +20,10 @@
 
 #include <rte_compat.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /**
  * rte_rib_get_nxt() flags
  */
@@ -282,4 +286,8 @@ __rte_experimental
 void
 rte_rib_free(struct rte_rib *rib);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _RTE_RIB_H_ */

lib/librte_rib/rte_rib6.h

@@ -21,6 +21,10 @@
 #include <rte_memcpy.h>
 #include <rte_compat.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #define RTE_RIB6_IPV6_ADDR_SIZE	16
 
 /**
@@ -339,4 +343,8 @@ __rte_experimental
 void
 rte_rib6_free(struct rte_rib6 *rib);
 
-#endif /* _RTE_RIB_H_ */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_RIB6_H_ */