Merge topic 'cmList-append-regression'

ee5edf77db Merge branch 'backport-3.27-cmList-append-regression' into cmList-append-regression
a9a34edc82 cmList: Fix performance regression in append/prepend
7f9f96151a cmList: Fix performance regression in append/prepend

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !8684