### Godot version

4.0.beta10 mono and standard

### System information

Windows 10 64bits

### Issue description

When exporting a project, Godot fails to bundle the required DLLs from the GDExtension to the export folder:

```
editor/export/editor_export_plugin.h:123 - Required virtual method EditorExportPlugin::_get_name must be overridden before calling.
  No suitable library found for GDExtension: res://webrtc/webrtc.gdextension. Possible feature flags for your platform: pc, s3tc, windows, x86_64, template, template_debug
```

### Steps to reproduce

Export for Windows with the existing configuration: WebRTC DLLs won't be copied in the export folder

### Minimal reproduction project

[Repro.zip](https://github.com/godotengine/godot/files/10368987/Repro.zip)

String fcache = export_base_path.path_join("file_cache");
		Ref<FileAccess> f = FileAccess::open(fcache, FileAccess::WRITE);
		if (f.is_valid()) {
			for (const KeyValue<String, FileExportCache> &E : export_cache) {
				if (E.value.used) { 
					String l = E.key + "::" + E.value.source_md5 + "::" + itos(E.value.source_modified_time) + "::" + E.value.saved_path;
					f->store_line(l);
				}
			}
		} else {
			ERR_PRINT("Error opening export file cache: " + fcache);
		}
		for (uint32_t i = 0; i < customize_resources_plugins.size(); i++) {
			customize_resources_plugins[i]->_end_customize_resources();
		}
		for (uint32_t i = 0; i < customize_scenes_plugins.size(); i++) {
			customize_scenes_plugins[i]->_end_customize_scenes();
		}
	}
	
	Vector<String> custom_list;
	if (!p_preset->get_custom_features().is_empty()) {
		Vector<String> tmp_custom_list = p_preset->get_custom_features().split(",");
		for (int i = 0; i < tmp_custom_list.size(); i++) {
			String f = tmp_custom_list[i].strip_edges();
			if (!f.is_empty()) {
				custom_list.push_back(f);
			}
		}