merge revision(s) 39329: [Backport #8011]

	enumerator.c: suppress warnings

	* enumerator.c (lazy_zip_arrays_func, lazy_zip_func, lazy_take_func),
  (lazy_drop_func, lazy_drop_while_func): suppress uninitialized
  instance vriable warnings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@39587 b2dd03c8-39d4-4d8f-98ff-823fe69b080e