message: COMP: Prepare for C++11 features in ITKv5
  ITKv5 is going to require C++11 so require newer
  versions of cmake features when the CMAKE_CXX_STANDARD
  flag is present so that these standards are respected.
diff: #=========================================================
  # RTK : Reconstruction Toolkit
  #=========================================================
  -cmake_minimum_required(VERSION 2.8.4 FATAL_ERROR)
  -if(WIN32 OR NOT EXISTS /dev/urandom)
  - cmake_minimum_required(VERSION 2.8.5)
  -endif()
  +# Respect the CMAKE_CXX_STANDARD flags when building for
  +# ITKv5 or C++11.
  +cmake_minimum_required(VERSION 3.9.5 FATAL_ERROR)
  ## Tell CMake to be quiet
  cmake_policy(SET CMP0003 NEW)
  