MAVLINK Adaptation for SKY9X (not working on 9xRPRO for now)

Hi,
my name is Adriano and i modified v2.13 to
compile for sky9x with MAVLINK protocol.
It is working and i kindly ask you can include
these very little mods in mainstream.

Thank you for all your great job


note: i use slackware-linux(64bit) and gcc 4.7.3 and it compiles OK :-)
forget line 118, only line 124 seem necessary to me