Non-trivial issue cmtk: FTBFS with CMake 4

[Andreas Tille <andreas@an3as.eu>]

Hi,

this issue is infortunately non-trivial and a simple
   DCMAKE_POLICY_VERSION_MINIMUM=3.5
is not sufficient to solve the bug.  It would be great if anyone with
some CMake knowledge could have a look.

Kind regards
   Andreas.

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