message: Fix random new CI failure by setting CMAKE_CXX_STANDARD_REQUIRED
diff: # Build as C++14 for the python bindings template-fu
  if (CMAKE_VERSION VERSION_LESS "3.1")
  - set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} --std=c++14")
  + set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
  else ()
  set (CMAKE_CXX_STANDARD 14)
  + set (CMAKE_CXX_STANDARD_REQUIRED ON)
  endif ()
  # include paths for qrenderdoc, the internal renderdoc API, and Python
  