message: Drop CMake requirement to 3.5
diff: # accompanying file Copyright.txt for details.
  #------------------------------------------------------------------------------#
  -cmake_minimum_required(VERSION 3.7)
  +cmake_minimum_required(VERSION 3.5)
  # Fail immediately if not using an out-of-source build
  if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_CURRENT_BINARY_DIR)
  