Revert r289150:

Correct handling of enum attributes with g++

It is causing issues on some platforms.

Reported by:	sbruno (through adrian)

contrib/gcc/cp/parser.c

@@ -10906,7 +10906,6 @@ cp_parser_enum_specifier (cp_parser* parser)
   if (cp_parser_allow_gnu_extensions_p (parser))
     {
       tree trailing_attr = cp_parser_attributes_opt (parser);
-      trailing_attr = chainon (trailing_attr, attributes);
       cplus_decl_attributes (&type,
 			     trailing_attr,
 			     (int) ATTR_FLAG_TYPE_IN_PLACE);