Fix unused variables errors in Pixhawk build
Merge pull request #533 from DonLakeFlyer/FixPixhawkErrors

Fix unused variables errors in Pixhawk build
Turn off -Werror for Linux
Merge pull request #536 from DonLakeFlyer/LinuxWarningsOff

Turn off -Werror for Linux
Merge remote-tracking branch 'upstream/master' into archlinux_dev3