CMake: do not expand variables beforehand

Vlad Zahorodniirequested to merge
work/cherry-pick-83a2448b into Plasma/6.2

See also: libplasma!267 (merged)

Signed-off-by: Andreas Sturmlechner asturm@gentoo.org

(cherry picked from commit 83a2448b)

Co-authored-by: Andreas Sturmlechner asturm@gentoo.org

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