* ext/iconv/iconv.c (iconv_convert, iconv_finish, iconv_iconv,
  iconv_conv): set result string encoding.  [ruby-dev:32446]

* ext/iconv/iconv.c (iconv_initialize, iconv_s_open): set encoding to
  Iconv instance.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@14098 b2dd03c8-39d4-4d8f-98ff-823fe69b080e