Upgrade existing Gem override by rewriting.
Upgrade existing Gem override by rewriting.

If an existing operating_system.rb is discovered during a
'ruby dk.rb install --force' operation, create a backup of
the original file and create a new version containing all
existing non-DevKit code plus the new DevKit code appended
to the end of the new file.

leonhooijer/rubyinstaller,leonhooijer/rubyinstaller,auyaauya/rubyinstaller,zorosteven/rubyinstaller,haonaturel/rubyinstaller,oneclick/rubyinstaller,leonhooijer/rubyinstaller,vemmaverve/rubyinstaller,jaym/rubyinstaller,vemmaverve/rubyinstaller,haonaturel/rubyinstaller,Rugbyman21/rubyinstaller,modulexcite/rubyinstaller,zorosteven/rubyinstaller,Rugbyman21/rubyinstaller,auyaauya/rubyinstaller,suvarnaraju/rubyinstaller,shirosaki/rubyinstaller,dreamauya/rubyinstaller,vemmaverve/rubyinstaller,jahanzaibbahadur/rubyinstaller,shirosaki/rubyinstaller,jahanzaibbahadur/rubyinstaller,suvarnaraju/rubyinstaller,zorosteven/rubyinstaller,jahanzaibbahadur/rubyinstaller,oneclick/rubyinstaller,oneclick/rubyinstaller,dreamauya/rubyinstaller,dreamauya/rubyinstaller,modulexcite/rubyinstaller,jaym/rubyinstaller,shirosaki/rubyinstaller,auyaauya/rubyinstaller,modulexcite/rubyinstaller,haonaturel/rubyinstaller,jaym/rubyinstaller,suvarnaraju/rubyinstaller,Rugbyman21/rubyinstaller