encoding.c: load by rb_require_internal
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48700 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
encoding.c: load by rb_require_internal
calling rb_require_safe with protection.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48700 b2dd03c8-39d4-4d8f-98ff-823fe69b080e