Ruby

merges r33201 from trunk into ruby_1_9_3.¶

• encoding.c (load_encoding): predefined encoding names are safe.
  [ruby-dev:44469] [Bug #5279]
• transcode.c (load_transcoder_entry): ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@33249 b2dd03c8-39d4-4d8f-98ff-823fe69b080e