Merge topic 'cmake-E-time-chrono'

bf5512ef51 Help:cmake -E time: note overhead included
848f7b0a81 cmake -E time: use C++11 chrono and better format output

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !8209