Also include the unsafe_define in wrapper mode.

This way, forward declarations are actually interestingly usable.

PiperOrigin-RevId: 778147370
Change-Id: I700fc78adac4be1152b63a25c547478dbb8d026a

Author: ssbr

rs_bindings_from_cc/generate_bindings/generate_struct_and_union.rs

@@ -562,8 +562,7 @@ pub fn generate_record(db: &dyn BindingsGenerator, record: Rc<Record>) -> Result
         } else {
             vec![]
         };
-    let incomplete_definition = if crubit_features
-        .contains(crubit_feature::CrubitFeature::Experimental)
+    let incomplete_definition = if crubit_features.contains(crubit_feature::CrubitFeature::Wrapper)
     {
         Some(quote! {
             forward_declare::unsafe_define!(forward_declare::symbol!(#fully_qualified_cc_name), #qualified_ident);