(class_add_method_list): Check for the +load method when adding a methods list to...

(class_add_method_list): Check for the +load method when adding a methods list to a class.

(class_add_method_list): Check for the +load method when adding a
methods list to a class.
(__objc_install_methods_in_dtable): New function.
(class_add_method_list): Don't check anymore for duplicate methods.

From-SVN: r13711