thread_win32.c: fix index
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread_win32.c: fix index
case of interrupt_event is not usable.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58382 b2dd03c8-39d4-4d8f-98ff-823fe69b080e