this fixes the build with HIL_MODE_ATTITUDE and MAVLink enabled. Basic MAVLink operation works. git-svn-id: https://arducopter.googlecode.com/svn/trunk@1737 f9c3cf11-9bcb-44bc-f272-b75c42450872
git-svn-id: https://arducopter.googlecode.com/svn/trunk@1736 f9c3cf11-9bcb-44bc-f272-b75c42450872