win32ole: unused variables

* ext/win32ole/win32ole.c (ole_methods_sub, ole_variables),
  (ole_search_event_at): remove unused variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38860 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
win32ole: warning flag

* ext/win32ole/extconf.rb (create_win32ole_makefile): replace or
  append warning flag.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38861 b2dd03c8-39d4-4d8f-98ff-823fe69b080e