Fix native extension compilation error with mysql2
Created by: snez
Solution found here: http://stackoverflow.com/questions/10051448/error-failed-to-build-gem-native-extension-mysql2-on-rails-3-2-3
Created by: snez
Solution found here: http://stackoverflow.com/questions/10051448/error-failed-to-build-gem-native-extension-mysql2-on-rails-3-2-3