envutil.rb: env hash

* test/ruby/envutil.rb (assert_separately): keep environment hash
  first if exists.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40331 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
test_readline.rb: try UTF-8

* test/readline/test_readline.rb (test_completion_encoding),
  (test_input_metachar_multibyte): try to run under UTF-8 locale,
  before skipping.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40332 b2dd03c8-39d4-4d8f-98ff-823fe69b080e