win32.c: fix conversion
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32.c: fix conversion
should have UTF-8 encoding. otherwise no conversion takes place
later.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42399 b2dd03c8-39d4-4d8f-98ff-823fe69b080e