- sitl_gazebo in PX4/Firmware (dcd12b5f): https://github.com/PX4/sitl_gazebo/commit/5a50cb9a52737522b28abf14ce15b57de8ff2695
    - sitl_gazebo current upstream: https://github.com/PX4/sitl_gazebo/commit/7c97eeae139d86b3747ea877d8067fb3180dc4f1
    - Changes: https://github.com/PX4/sitl_gazebo/compare/5a50cb9a52737522b28abf14ce15b57de8ff2695...7c97eeae139d86b3747ea877d8067fb3180dc4f1

 - explicitly set TOOLCHAIN on all NuttX targets

launch script for jmavsim failed to start if there were any spaces in
paths, string handling in paths was improved and tested.

*  a request for setting the '_HASH_CHECK' parameter is handled differently
than the same request for a standard parameter. Make sure we don't actually
try to set the parameter.

Signed-off-by: Roman <bapstroman@gmail.com>

Co-Authored-By: CUAVcaijie <caijie@cuav.net>

 - keeping nuttx and armhf compile jobs on 2018-09-11 for now

    - Mavlink v2.0 in PX4/Firmware (d1dc8e440912e7918465163195b73531138e1e8c): https://github.com/mavlink/c_library_v2/commit/6203e2b64395cfa416b9321f633bc3256a79f722
    - Mavlink v2.0 current upstream: https://github.com/mavlink/c_library_v2/commit/7c47254ddc8bf70eb5e82b4c2142a3faa4fa5780
    - Changes: https://github.com/mavlink/c_library_v2/compare/6203e2b64395cfa416b9321f633bc3256a79f722...7c47254ddc8bf70eb5e82b4c2142a3faa4fa5780

    7c47254 2018-11-21 PX4BuildBot - autogenerated headers for rev https://github.com/mavlink/mavlink/tree/aa72b9e9806854ee822eb2fb4c70c26216113141