howard-hinnant-date: enable for Windows (#347330)

  outputs = [ "out" "dev" ];

  # fixes "cycle detected in build"

  postInstall = lib.optionalString stdenv.hostPlatform.isWindows ''

    mkdir $dev/lib

    mv $out/CMake $dev/lib/cmake

  '';

  meta = with lib; {

    license = licenses.mit;

    description = "Date and time library based on the C++11/14/17 <chrono> header";

    homepage = "https://github.com/HowardHinnant/date";

    platforms = platforms.unix;

    platforms = with platforms; unix ++ windows;

    maintainers = with maintainers; [ r-burns ];

  };

}