Mavlink: Update Mavlink library
Merge pull request #1038 from arthurbenemann/mavlink_update

Update Mavlink library
fixed issue #1043
Merge branch 'master' of https://github.com/DroidPlanner/droidplanner into fix_issue_1043
Merge pull request #1046 from ne0fhyk/fix_issue_1043

Fix issue #1043