mule-util and cl-seq loaded when opening c++ source file

[William Payne]

When I open a file that triggers my c++ mode, the last message I see in the 
Messages buffer is:

Loading mule-util...done

what is that and is it something I need?
the complete list is (plus my .emacs):
Loading cc-mode...done
Loading cl-seq...done
Loading mule-util...done

Obviously I want cc-mode, but what is cl-seq and mule-util. I would like to 
remove them if it's not something I use.

/ WP