Ruby

win32_vk.inc: suppress warnings

• ext/io/console/depend (win32_vk.inc): use offsetof() to suppress
  warnings against cast from pointer to integer of different size.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50859 b2dd03c8-39d4-4d8f-98ff-823fe69b080e