New cmake warning.

[Méven]

I am guessing you are using cmake >= 3.16 so it allows you to run, but
since the project does not have a cmake minimum, for others using cmake <
3.16 the build will break.
This warning highlights it, so you inform your contributor they need cmake
3.16 before running into the hard fail in FindKF5.

TLDR; If you use FindKF5,  you should add cmake minimal version 3.16.

-- 
Méven
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