- v2.0 in PX4/Firmware (5e76f2dca7530404173601b4a231778381d4f3cc): https://github.com/mavlink/c_library_v2/commit/033fa8e7a4a75a0c3f17cea57e3be8966e05f770
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/f5c0ba684659fbc6c6c5f8777bd30e0b3c32fdef
    - Changes: https://github.com/mavlink/c_library_v2/compare/033fa8e7a4a75a0c3f17cea57e3be8966e05f770...f5c0ba684659fbc6c6c5f8777bd30e0b3c32fdef

    f5c0ba6 2018-06-19 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/40f8149d642892b87c61acf3fb63d2512d06a22a

    - v2.0 in PX4/Firmware (a19fecad): https://github.com/mavlink/c_library_v2/commit/653ac745a57794a38c831f1ff296066a2e09c09b
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/033fa8e7a4a75a0c3f17cea57e3be8966e05f770
    - Changes: https://github.com/mavlink/c_library_v2/compare/653ac745a57794a38c831f1ff296066a2e09c09b...033fa8e7a4a75a0c3f17cea57e3be8966e05f770

    033fa8e 2018-05-24 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/d8ea87b9c6173ad72a032219588e302eb8cb212a

This fixes the compiler warning with GCC 8.

This updates the MAVLink submodule to the current version including the trajectory WIP messages.

- v2.0 in PX4/Firmware (23017d051b7ff6686c8c8ff025a8e98af094780a): https://github.com/mavlink/c_library_v2/commit/163d4c84b9eb58a02cab94d039f54c303977d991
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/c55dd0ec312a667f28b0cab4f1fe697d2888c00c
    - Changes: https://github.com/mavlink/c_library_v2/compare/163d4c84b9eb58a02cab94d039f54c303977d991...c55dd0ec312a667f28b0cab4f1fe697d2888c00c

    c55dd0e 2018-04-12 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/292874beed6bf756be45421bd2ae2420de921f2b
e2916e5 2018-04-10 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/012765b923546224ef928caeb86c72d5a78a433a

- v2.0 in PX4/Firmware (3ec37aa1): https://github.com/mavlink/c_library_v2/commit/95d4cb3b21130d67b251f323482f1c3fe1ce0c6c
    - v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/163d4c84b9eb58a02cab94d039f54c303977d991
    - Changes: https://github.com/mavlink/c_library_v2/compare/95d4cb3b21130d67b251f323482f1c3fe1ce0c6c...163d4c84b9eb58a02cab94d039f54c303977d991

    163d4c8 2018-04-08 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/07c4fc5f617383707317128e87ec9a0489ed3634

Latest: https://github.com/mavlink/c_library_v2/commit/95d4cb3b21130d67b251f323482f1c3fe1ce0c6c

Changes from v2.0 (https://github.com/mavlink/c_library_v2/commit/37d14af47d783eb516959cc10e4cf70d66e927c0) in current PX4/master (9fc1755c)
https://github.com/mavlink/c_library_v2/compare/37d14af47d783eb516959cc10e4cf70d66e927c0...95d4cb3b21130d67b251f323482f1c3fe1ce0c6c

95d4cb3 2018-03-28 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/f29e3302fef08a9df6bd2b2e944f1fbf35637035
f8b4fc9 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/4accd6c062f6ca79a025f596744fc9cf907acc98
695883f 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/b4efea1609631683c7b29f85571ba2f34a10116e
1bb9b2c 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/56e28570a7557e62e95613d7bd13a96e8cf5e02e
68f9957 2018-03-27 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/8cf87fc5afe996604cc4399f21f83c7989ae5d9a
62abc60 2018-03-26 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/17207917a38ad690b3995e168b51bf232094b165
1b0dc47 2018-03-23 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/1d007c59dbe0121b7f2063a8919a44703634a5ef
925ab39 2018-03-21 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/5515533e8e5222aa1794616b124eddcaa040a5b3
f38624f 2018-03-15 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/91a22feb27e718373dd68e6fc57329f13f5e8d8a

This brings in new ROI commands and general sync.

 - update mavlink, cmake_hexagon, uavcan_board_ident to latest

The mavlink message MOUNT_STATUS has been renamed to MOUNT_ORIENTATION.

This changes the Firmware code accordingly.