Allow checkout of Ruby 1.9 trunk (1.9.2-dev)
Allow checkout of Ruby 1.9 trunk (1.9.2-dev)

Thanks Roger Pack for the suggestion and initial patch.

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