Rename OSX to macOS and iPhoneOS to iOS.

editor/project_manager.cpp

@@ -1998,7 +1998,7 @@ void ProjectManager::shortcut_input(const Ref<InputEvent> &p_ev) {
 		// Pressing Command + Q quits the Project Manager
 		// This is handled by the platform implementation on macOS,
 		// so only define the shortcut on other platforms
-#ifndef OSX_ENABLED
+#ifndef MACOS_ENABLED
 		if (k->get_keycode_with_modifiers() == (KeyModifierMask::CMD | Key::Q)) {
 			_dim_window();
 			get_tree()->quit();