message: fix checks in CMakeLists.txt
  CMP0077 requires >= 3.13
  CMP0091 + CMP0092 requires >= 3.15
diff: cmake_minimum_required(VERSION 3.0)
  -if (NOT CMAKE_VERSION VERSION_LESS 3.12)
  +if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.13)
  cmake_policy(SET CMP0077 NEW) # Enables override of options from parent CMakeLists.txt
  endif()
  -if (NOT CMAKE_VERSION VERSION_LESS 3.15)
  +if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.15)
  cmake_policy(SET CMP0091 NEW) # Enables use of MSVC_RUNTIME_LIBRARY
  cmake_policy(SET CMP0092 NEW) # Enables clean /W4 override for MSVC
  endif()
  