dir.c: fix escaping multibyte char
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49532 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
dir.c: fix escaping multibyte char
meta-char in trailing bytes, e.g., Shift-JIS
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49532 b2dd03c8-39d4-4d8f-98ff-823fe69b080e