win32.c: wchar conversion
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45521 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32.c: wchar conversion
WCHAR/mb conversion functions public.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45521 b2dd03c8-39d4-4d8f-98ff-823fe69b080e