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

	* transcode.c (load_transcoder_entry): ditto.

	* encoding.c (require_enc): reject only loading from untrusted
	  load paths.  [ruby-dev:44541] [Bug #5279]

	* transcode.c (load_transcoder_entry): ditto.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@34465 b2dd03c8-39d4-4d8f-98ff-823fe69b080e