message: manual_control: try to also get SDL2 on Arch
diff: @@ -10,12 +10,15 @@ endif()
  find_package(MAVSDK REQUIRED)
  find_package(SDL2 REQUIRED)
  -find_package(Threads)
  +find_package(Threads REQUIRED)
  add_executable(manual_control
  manual_control.cpp
  joystick.cpp
  )
  +if (NOT SDL2_LIBRARIES)
  + set(SDL2_LIBRARIES SDL2::SDL2)
  +endif()
  target_link_libraries(manual_control
  MAVSDK::mavsdk_action
  