euckr-tbl.rb: euro and registered signs

* enc/trans/euckr-tbl.rb (EUCKR_TO_UCS_TBL): add missing euro and
  registered signs.  [ruby-core:64452] [Bug #10149]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47221 b2dd03c8-39d4-4d8f-98ff-823fe69b080e