### Godot version

master

### System information

Ubuntu

### Issue description

I think one of the recent changes wrapped the project converter in `#ifndef DISABLE_DEPRECATED` but missed the coresponding code in `main.cpp` (and potentially other places).
```
main/main.cpp: In static member function 'static bool Main::start()':
main/main.cpp:2551:33: error: 'ProjectConverter3To4' was not declared in this scope
 2551 |                 int exit_code = ProjectConverter3To4(converter_max_kb_file, converter_max_line_length).convert();
      |                                 ^~~~~~~~~~~~~~~~~~~~
main/main.cpp:2556:33: error: 'ProjectConverter3To4' was not declared in this scope
 2556 |                 int exit_code = ProjectConverter3To4(converter_max_kb_file, converter_max_line_length).validate_conversion();
```

### Steps to reproduce

for instance, try to compile with `deprecated = "no"` in your `custom.py`.

### Minimal reproduction project

n/a
}
	if (text_driver_idx < 0) {
		/
		int max_features = 0;
		for (int i = 0; i < TextServerManager::get_singleton()->get_interface_count(); i++) {
			uint32_t features = TextServerManager::get_singleton()->get_interface(i)->get_features();
			int feature_number = 0;
			while (features) {
				feature_number += features & 1;
				features >>= 1;
			}
			if (feature_number >= max_features) {
				max_features = feature_number;
				text_driver_idx = i;
			}
		}
	}
	if (text_driver_idx >= 0) {
		Ref<TextServer> ts = TextServerManager::get_singleton()->get_interface(text_driver_idx);
		TextServerManager::get_singleton()->set_primary_interface(ts);
		if (ts->has_feature(TextServer::FEATURE_USE_SUPPORT_DATA)) {
			ts->load_support_data("res://" + ts->get_support_data_filename());
		}
	} else {
		ERR_FAIL_V_MSG(ERR_CANT_CREATE, "TextServer: Unable to create TextServer interface.");
	}
	engine->startup_benchmark_end_measure(); /
	MAIN_PRINT("Main: Load Scene Types");
	engine->startup_benchmark_begin_measure("scene");
	register_scene_types();