ancestors unless the recursive flag is set. [ruby-list:38007]
* hash.c (env_each_key): use env_keys to avoid environment modify
on the fly.
* hash.c (env_each_value): use env_values for safety.
* hash.c (env_each): allocate environment array first.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4277 b2dd03c8-39d4-4d8f-98ff-823fe69b080e