Merge topic 'return-propagate-variables'

838a5fae23 return(): Propagate variables to result scope
8f0e1f2111 cmMakefile: add RaiseScope for list of variables

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Acked-by: Robert Maynard <robertjmaynard@gmail.com>
Merge-request: !7634