parse.y: preserve encoding

* parse.y (parser_yyerror): preserve source code encoding in
  syntax error messages.  [ruby-core:64228] [Bug #10114]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47090 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-08-07

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47091 b2dd03c8-39d4-4d8f-98ff-823fe69b080e