Codegen excludes classes only on certain targets

Newly exclude JavaObject, which now caused CI failures.

Previously, classes like JavaClass etc. were not available at all, because Desktop Godot
targets did not support them. Now, they are conditionally included for Wasm/Android.

Author: Bromeon

godot-codegen/src/special_cases/special_cases.rs

@@ -97,6 +97,7 @@ pub fn is_native_struct_excluded(ty: &str) -> bool {
     codegen_special_cases::is_native_struct_excluded(ty)
 }
 
+#[rustfmt::skip]
 pub fn is_godot_type_deleted(godot_ty: &str) -> bool {
     // Note: parameter can be a class or builtin name, but also something like "enum::AESContext.Mode".
 
@@ -117,15 +118,20 @@ pub fn is_godot_type_deleted(godot_ty: &str) -> bool {
         }
     }
 
+    // cfg!(target_os = "...") are relatively new and need more testing. If causing problems, revert to `true` (deleted) for now.
+    // TODO(v0.5): for doc generation, consider moving the target-filters to the generated code, so that API docs still show the classes.
     match godot_ty {
-        // Hardcoded cases that are not accessible.
         // Only on Android.
+        | "JavaClass"
         | "JavaClassWrapper"
+        | "JavaObject"
         | "JNISingleton"
-        | "JavaClass"
+        => !cfg!(target_os = "android"),
+
         // Only on Wasm.
         | "JavaScriptBridge"
         | "JavaScriptObject"
+        => !cfg!(target_os = "emscripten"),
 
         // Thread APIs.
         | "Thread"