* array.c (rb_ary_or): use rb_hash_keys().

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43240 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* array.c (rb_ary_or): remove unused variables.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43241 b2dd03c8-39d4-4d8f-98ff-823fe69b080e