Merge topic 'ExternalProject-touch-echo'

3bf0830e44 ExternalProject: Avoid adding empty touch command on "ALWAYS" steps

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Acked-by: Craig Scott <craig.scott@crascit.com>
Merge-request: !8468