global,mainmenu: enable Quit if quitting is allowed in kiosk mode

src/global.c

@@ -50,8 +50,20 @@ bool gamekeypressed(KeyIndex key) {
 
 static SDL_atomic_t quitting;
 
+static bool taisei_is_quit_forbidden(void) {
+	return global.is_kiosk_mode && env_get("TAISEI_KIOSK_PREVENT_QUIT", true);
+}
+
+bool taisei_is_quit_hidden(void) {
+#ifdef __EMSCRIPTEN__
+	return true;
+#else
+	return taisei_is_quit_forbidden();
+#endif
+}
+
 void taisei_quit(void) {
-	if(global.is_kiosk_mode && env_get("TAISEI_KIOSK_PREVENT_QUIT", true)) {
+	if(taisei_is_quit_forbidden()) {
 		log_info("Running in kiosk mode; exit request ignored");
 		return;
 	}

src/global.h

@@ -108,6 +108,7 @@ void init_global(CLIAction *cli);
 
 void taisei_quit(void);
 bool taisei_quit_requested(void);
+bool taisei_is_quit_hidden(void);
 void taisei_commit_persistent_data(void);
 
 // XXX: Move this somewhere?

src/menu/mainmenu.c

@@ -127,10 +127,11 @@ MenuData* create_main_menu(void) {
 	add_menu_entry(m, "Replays", menu_action_enter_replayview, NULL);
 	add_menu_entry(m, "Media Room", menu_action_enter_media, NULL);
 	add_menu_entry(m, "Options", menu_action_enter_options, NULL);
-#ifndef __EMSCRIPTEN__
-	add_menu_entry(m, "Quit", global.is_kiosk_mode ? NULL : menu_action_close, NULL)->transition = TransFadeBlack;
-	m->input = main_menu_input;
-#endif
+
+	if(!taisei_is_quit_hidden()) {
+		add_menu_entry(m, "Quit", menu_action_close, NULL)->transition = TransFadeBlack;
+		m->input = main_menu_input;
+	}
 
 	stage_practice_entry = dynarray_get_ptr(&m->entries, stage_practice_idx);
 	spell_practice_entry = dynarray_get_ptr(&m->entries, spell_practice_idx);