Merge topic 'ExternalProject-revert-install'

771387523a ExternalProject: Restore driving install through build system

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Acked-by: Craig Scott <craig.scott@crascit.com>
Reviewed-by: Ben Boeckel <ben.boeckel@kitware.com>
Merge-request: !8279