re PR c++/17473 (typedef redefinition in struct is accepted)

	PR c++/17473
	* name-lookup.c (supplement_binding): Do not allow typedefs to be
	redefined in class scope.

	PR c++/18285
	* parser.c (cp_parser_set_decl_type_spec): Do not try to allow
	redefinitions of builtin types other that "bool" or "wchar_t".

	PR c++/17473
	* g++.dg/tc1/dr56.C: Remove.
	* g++.dg/template/typedef1.C: Add dg-error markers.
	* g++.old-deja/g++.other/typedef7.C: Likewise.

	PR c++/18285
	* g++.dg/parse/typedef7.C: New test.

From-SVN: r91254