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Cleanup cmake_minimum_required

Frank Winklmeier requested to merge fwinkl/atlasexternals:min_version into main

Cleanup cmake_minimum_required and policy settings:

  • Only keep cmake_minimum_required in top-level CMakeLists.txt.
  • Increase the minimum cmake version to 3.25 for ATLAS projects (required by !1166 (merged)) and fixes warnings in cmake 3.31 (ATLINFR-5585).
  • Add INDEPENDENT TRUE to all ExternalProject_Add steps that depend on the "download" targets as required by cmake >= 3.19 (see CMP0114).

Also:

  • delete obsolete FindPython[Interp,Libs]
  • remove code dependent on now unsupported CMAKE_VERSION
Edited by Frank Winklmeier

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