Added missing HAVE_RPL compiler flag

(cherry picked from commit b838f8d2eb6504e5987b2db840a239fcd90fb335)

Author: Jarkko Paso

source/6LoWPAN/Bootstraps/Generic/protocol_6lowpan_bootstrap.c

@@ -845,9 +845,11 @@ static bool mle_parent_link_req_cb(int8_t interface_id, uint16_t msgId, bool use
                 tr_debug("Link synch fail %u", cur->nwk_bootstrap_state);
                 bootsrap_next_state_kick(ER_BOOTSTRAP_CONNECTION_DOWN, cur);
                 break;
+#ifdef HAVE_RPL
             case ER_ROUTER_SYNCH:
                 bootsrap_next_state_kick(ER_RPL_MC, cur);
                 break;
+#endif // HAVE_RPL
             default:
                 break;
         }

source/NWK_INTERFACE/Include/protocol.h

@@ -102,7 +102,9 @@ typedef enum icmp_state {
     ER_MLE_LINK_REQ = 13,
     ER_MLE_LINK_SHORT_SYNCH = 14,
     ER_MLE_LINK_ADDRESS_SYNCH = 15,
+#ifdef HAVE_RPL
     ER_ROUTER_SYNCH = 17,
+#endif
     ER_PANA_PING = 18,
     ER_PARENT_SYNCH_LOST = 19,
     ER_MLE_SCAN = 20,