Added missing c-return event patch for Ruby 2.0.0-p353

As specified in
https://github.com/skaes/rvm-patchsets/blob/master/patches/ruby/2.0.0/p353/railsexpress/05-fix-missing-c-return-event.patch
Merge pull request #184 from dennmart/add-missing-c-return-event-patch

Added missing c-return event patch for Ruby 2.0.0-p353