dir.c: try match PLAIN
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45969 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dir.c: try match PLAIN
separated by previous commits. [ruby-core:61552] [Bug #9648]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45969 b2dd03c8-39d4-4d8f-98ff-823fe69b080e