add-LANG_CPPLINT
----------------

* A :prop_tgt:`<LANG>_CPPLINT` target property and supporting
  :variable:`CMAKE_<LANG>_CPPLINT` variable were introduced to tell
  the :ref:`Makefile Generators` and the :generator:`Ninja` generator to
  run the ``cpplint`` style checker along with the compiler for ``C`` and
  ``CXX`` languages.