Merge topic 'update-kwsys'

3ef5dab010 cmSystemTools: Simplify using KWSys Status
ec1b6157cb Update CMake code using KWSys to account for Status return values
eef585efaa Merge branch 'upstream-KWSys' into update-kwsys
a790167101 KWSys 2021-04-14 (7ab1c601)

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !6004