file.c: isADS
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56996 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
file.c: isADS
separator, to distinguish from drive letter.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56996 b2dd03c8-39d4-4d8f-98ff-823fe69b080e