merge revision(s) r45453: [Backport #9798]

	* ext/psych/yaml/config.h: ditto.

	* ext/psych/yaml/scanner.c: ditto.

	* ext/psych/yaml/yaml_private.h: ditto.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_0_0@45870 b2dd03c8-39d4-4d8f-98ff-823fe69b080e