cmake: Bump required CMake version to 3.5 to allow builds with CMake 4+

This enables builds with CMake 4+, fixing:

    CMake Error at CMakeLists.txt:1 (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.

While at it, remove the extra call to 'cmake_policy()'. When passing the same
version as to 'cmake_minimum_required()' it's not needed, as the latter calls
the former automatically.

Signed-off-by: Moritz Haase <Moritz.Haase@bmw.de>

Author: moha-gh

CMakeLists.txt

@@ -1,5 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
-cmake_policy(VERSION 3.0)
+cmake_minimum_required(VERSION 3.5)
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(VersioningUtils)