* hash.c (env_enc_str_new): make string for an environment
variable name or value.
* hash.c (env_name_new): make environment value string with the
encoding for its name.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55819 b2dd03c8-39d4-4d8f-98ff-823fe69b080e