mavros compilation error on arm64

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Issue details

On amd64 platforms mavros builds fine, but on an arm64, specifically the NVidia TX2, there is a timing error between mavros_msgs and mavros, causing a compile error with a missing include. This is remedied by building twice.

compile error:

In file included from /ros_catkin_ws/src/mavros/mavros/include/mavros/utils.h:22:0,
                 from /ros_catkin_ws/src/mavros/mavros/include/mavros/mavros_uas.h:29,
                 from /ros_catkin_ws/src/mavros/mavros/src/lib/uas_data.cpp:17:
/ros_catkin_ws/src/mavros/mavros_msgs/include/mavros_msgs/mavlink_convert.h:17:33: fatal error: mavros_msgs/Mavlink.h: No such file or directory
compilation terminated.
mavros/mavros/CMakeFiles/mavros.dir/build.make:62: recipe for target 'mavros/mavros/CMakeFiles/mavros.dir/src/lib/uas_data.cpp.o' failed

MAVROS version and platform

Mavros: 0.29 (master)
ROS: Kinetic
Ubuntu: 16.04