Update p5-Class-MOP from version 0.84 to version 0.85.

Upstream changes:
0.85 Sat, Jun 6, 2009
    * Class::MOP::Attribute
      - Allow default values to be Class::MOP::Methods.  (Florian
        Ragwitz)
      - Test the above. (Rhesa Rozendaal)
      - Tweak original commit so the intent matches the accepted
        behavior (Nicholas Perez)

    * Class::MOP
      - Localize $SIG{__DIE__} inside _try_load_one_class (Sartak)

    * Class::MOP::Class
      - Add direct_subclasses method (Sartak)
        - Tests for subclasses and direct_subclasses (Sartak)
      - subname is no longer used unconditionally in add_method, but
        only if the code reference's name is '__ANON__' (nothingmuch)
      - Add a hook for _superclasses_updated (Sartak)

    * Class::MOP::Method
      - Remove long, old warning about possibly outdated modules
        (Sartak)

(seb)