thread_win32.c: suppress warning
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
thread_win32.c: suppress warning
false positive might-be-clobbered warning.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e