Mavlink: enable MAVLINK_SEPARATE_HELPERS

this fixes a seq number problem with SIMSTATE packets

libraries/GCS_MAVLink/GCS_MAVLink.cpp

@@ -15,6 +15,10 @@ version 2.1 of the License, or (at your option) any later version.
 #include <AP_Common.h>
 #include <GCS_MAVLink.h>
 
+#ifdef MAVLINK_SEPARATE_HELPERS
+#include "include/mavlink/v1.0/mavlink_helpers.h"
+#endif
+
 
 BetterStream	*mavlink_comm_0_port;
 BetterStream	*mavlink_comm_1_port;

libraries/GCS_MAVLink/GCS_MAVLink.h

@@ -10,7 +10,7 @@
 
 // we have separate helpers disabled to make it possible
 // to select MAVLink 1.0 in the arduino GUI build
-//#define MAVLINK_SEPARATE_HELPERS
+#define MAVLINK_SEPARATE_HELPERS
 
 #include "include/mavlink/v1.0/ardupilotmega/version.h"