Merge topic 'cmstrcat-move-first-arg'

beba50bd61 cmStrCat(): optimize when first argument is an rvalue string
d6f2a7ab4b cmStringCommand: remove use of cmCatViews()

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !7969