win32/file.c: remove a codepage argument
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56006 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32/file.c: remove a codepage argument
INVALID_CODE_PAGE for conversion by econv.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56006 b2dd03c8-39d4-4d8f-98ff-823fe69b080e