enumerator.c: fix non-single argument

* enumerator.c (lazy_zip_func): fix non-single argument.  fix
  out-of-bound access and pack multiple yielded values.
  [ruby-core:56383] [Bug #8735]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42450 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-08-09

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42451 b2dd03c8-39d4-4d8f-98ff-823fe69b080e