Update devel/ruby-activesupport to 2.3.9.

* Use lang/ruby/gem.mk instead of misc/rubygems/rubygem.mk.
* Add LICENSE.
* Remove default value of GEM_BUILD.

*2.3.9 (September 4, 2010)*

* i18n: bundle i18n 0.4.1 for forward compatibility with Rails 3.
  Deprecates {{foo}} interpolation syntax in favor of 1.9-native %{foo}.

* Deprecate Kernel#returning in favor of Object#tap since it's included
  in Ruby 1.8.7 and later. [Santiago Pastorino]

* Deprecates ActiveSupport::Dependencies.load_(once_)paths, renamed to
  autoload_(once_)paths. [fxn]

* Deprecates Array#random_element, renamed to sample to match Ruby 1.9,
  thanks to Marc-Andre Lafortune. [fxn]

(taca)