CheckIncludeFile-required-libs
------------------------------

* The :module:`CheckIncludeFile` module ``check_include_file`` macro
  learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable.

* The :module:`CheckIncludeFileCXX` module ``check_include_file_cxx`` macro
  learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable.

* The :module:`CheckIncludeFiles` module ``check_include_files`` macro
  learned to honor the ``CMAKE_REQUIRED_LIBRARIES`` variable.
