Update p5-Class-MOP from version 0.89 to version 0.90.

pkgsrc changes:
- More build dependencies (for test target)

Upstream changes:
0.90 Tue Jul 21, 2009
    Japan Perl Association has sponsored Goro Fuji to improve startup
    performance of Class::MOP and Moose. These enhancements may break
    backwards compatibility if you're doing (or using) complex
    metaprogramming, so, as always, test your code!
    http://blog.perlassociation.org/2009/07/jpa-sponsors-moose-class-mop-work.html

    * Class::MOP::Class
    * XS
      - Anonymous classes were not completely destroyed when they went
        out of scope, leading to a memory leak. RT #47480. (Goro
        Fuji).

    * Class::MOP::Class
      - The get_method, has_method, and add_method methods no longer
        use get_method_map. Method objects are instantiated
        lazily. This significantly improves Class::MOP's load
        time. (Goro Fuji)

    * All classes
      - Inline fewer metaclass-level constructors since the ones we
        have are perfectly fine. This reduces the number of string
        evals. (Goro Fuji)

    * Class::MOP::Method::Wrapped
      - If a method modifier set $_, this caused the modifier to blow
        up, because of some weird internals. (Jeremy Stashewsky)


(seb)