Update mavlink

Currently the PARAM_EXT param_value field is broken due to a recent
pymavlink change. Until that's fixed, we have to carry another patch.

Author: julianoes

src/mavsdk/plugins/camera_server/camera_server_impl.cpp

@@ -2151,7 +2151,7 @@ void CameraServerImpl::send_tracking_status_with_interval(uint32_t interval_us)
                         &message,
                         CAMERA_TRACKING_STATUS_FLAGS_IDLE,
                         CAMERA_TRACKING_MODE_NONE,
-                        CAMERA_TRACKING_TARGET_DATA_NONE,
+                        0, // used to be CAMERA_TRACKING_TARGET_DATA_NONE
                         0.0f,
                         0.0f,
                         0.0f,

third_party/mavlink/CMakeLists.txt

@@ -9,7 +9,7 @@ list(APPEND CMAKE_ARGS
     "-DMAVLINK_DIALECT=${MAVLINK_DIALECT}"
     )
 
-set(MAVLINK_GIT_HASH 5e3a42b8f3f53038f2779f9f69bd64767b913bb8)
+set(MAVLINK_GIT_HASH 3ca42d6cdab73122d9c677f88e64882ef2b0dde8)
 
 if(IOS)
     ExternalProject_add(

third_party/mavlink/mavlink.patch

@@ -3,9 +3,9 @@ index 8aadc9af..0bb61919 100644
 --- a/CMakeLists.txt
 +++ b/CMakeLists.txt
 @@ -2,6 +2,20 @@ cmake_minimum_required(VERSION 3.13)
- 
+
  project(mavlink)
- 
+
 +if (POLICY CMP0094)
 +    cmake_policy(SET CMP0094 NEW)  # FindPython should return the first matching Python
 +endif ()
@@ -21,5 +21,6 @@ index 8aadc9af..0bb61919 100644
 +endif()
 +
  find_package(Python COMPONENTS Interpreter REQUIRED)
- 
+
  # We automatically install the pip dependencies locally below.
+