export transcode exceptions

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61910 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

include/ruby/ruby.h

@@ -1987,6 +1987,9 @@ RUBY_EXTERN VALUE rb_eSysStackError;
 RUBY_EXTERN VALUE rb_eRegexpError;
 RUBY_EXTERN VALUE rb_eEncodingError;
 RUBY_EXTERN VALUE rb_eEncCompatError;
+RUBY_EXTERN VALUE rb_eUndefinedConversionError;
+RUBY_EXTERN VALUE rb_eInvalidByteSequenceError;
+RUBY_EXTERN VALUE rb_eConverterNotFoundError;
 
 RUBY_EXTERN VALUE rb_eScriptError;
 RUBY_EXTERN VALUE rb_eNameError;