Merge topic 'update-kwsys'

a37614667d Configure KWSys to honor CMake_NO_CXX_STANDARD
e3b26f0004 Merge branch 'upstream-KWSys' into update-kwsys
c22e373a30 KWSys 2019-01-30 (ce89cada)

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !2886