(finish_struct): A data member with the same name as the class doesn't

(finish_struct): A data member with the same name as the class doesn't
suppress constructors.
(dont_allow_type_definitions): New variable set when types cannot be defined.
(finish_struct): Use it.
(build_vfn_ref): Deleted signature specific code, we don't call this function
anymore from build_signature_method_call.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@10038 138bc75d-0d04-0410-961f-82ee72b054a4