io.c: fix non-ascii filename inplace edit
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64243 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
io.c: fix non-ascii filename inplace edit
dealt with by system calls. [ruby-dev:50607] [Bug #14970]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64243 b2dd03c8-39d4-4d8f-98ff-823fe69b080e