CMake 4: Build fails with `Compatibility with CMake < 3.5 has been removed from CMake.`.

Ahoj,

with Cmake 4, `cmake` run fails with  
```
CMake Error at CMakeLists.txt:23 (cmake_minimum_required):
  Compatibility with CMake < 3.5 has been removed from CMake.

  Update the VERSION argument <min> value.  Or, use the <min>...<max> syntax
  to tell CMake that the project requires at least <min> but has been updated
  to work with policies introduced by <max> or earlier.

  Or, add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to try configuring anyway.


-- Configuring incomplete, errors occurred!
```

Workaround adding `-DCMAKE_POLICY_VERSION_MINIMUM=3.5` makes it building, but actually this issue popped up at some projects with Cmake 4 and means that some things have to be updated, see e.g. [here](https://github.com/analogdevicesinc/libm2k/issues/385#issuecomment-2891250887).

Regards!

[]