AP_Mount: add HAL_MOUNT_STORM32MAVLINK_ENABLED build option

libraries/AP_Mount/AP_Mount.cpp

@@ -462,10 +462,12 @@ void AP_Mount::init()
             _num_instances++;
 #endif
 
+#if HAL_MOUNT_STORM32MAVLINK_ENABLED
         // check for SToRM32 mounts using MAVLink protocol
         } else if (mount_type == Mount_Type_SToRM32) {
             _backends[instance] = new AP_Mount_SToRM32(*this, state[instance], instance);
             _num_instances++;
+#endif
 
         // check for SToRM32 mounts using serial protocol
         } else if (mount_type == Mount_Type_SToRM32_serial) {

libraries/AP_Mount/AP_Mount_SToRM32.cpp

@@ -1,5 +1,6 @@
 #include "AP_Mount_SToRM32.h"
-#if HAL_MOUNT_ENABLED
+
+#if HAL_MOUNT_STORM32MAVLINK_ENABLED
 #include <AP_HAL/AP_HAL.h>
 #include <GCS_MAVLink/GCS.h>
 
@@ -172,4 +173,4 @@ void AP_Mount_SToRM32::send_do_mount_control(float pitch_deg, float roll_deg, fl
     // store time of send
     _last_send = AP_HAL::millis();
 }
-#endif // HAL_MOUNT_ENABLED
+#endif // HAL_MOUNT_STORM32MAVLINK_ENABLED

libraries/AP_Mount/AP_Mount_SToRM32.h

@@ -5,7 +5,11 @@
 
 #include "AP_Mount_Backend.h"
 
-#if HAL_MOUNT_ENABLED
+#ifndef HAL_MOUNT_STORM32MAVLINK_ENABLED
+#define HAL_MOUNT_STORM32MAVLINK_ENABLED HAL_MOUNT_ENABLED
+#endif
+
+#if HAL_MOUNT_STORM32MAVLINK_ENABLED
 
 #include <AP_Math/AP_Math.h>
 #include <AP_Common/AP_Common.h>
@@ -49,4 +53,4 @@ private:
     mavlink_channel_t _chan;        // mavlink channel used to communicate with gimbal
     uint32_t _last_send;            // system time of last do_mount_control sent to gimbal
 };
-#endif // HAL_MOUNT_ENABLED
+#endif // HAL_MOUNT_STORM32MAVLINK_ENABLED