port: add exit option to 4mb menu

src/game/fmb.c

@@ -585,6 +585,16 @@ struct menuitem g_MainMenu4MbMenuItems[] = {
 		0,
 		(void *)&g_ChangeAgentMenuDialog,
 	},
+#ifndef PLATFORM_N64
+	{
+		MENUITEMTYPE_SELECTABLE,
+		0,
+		MENUITEMFLAG_SELECTABLE_OPENSDIALOG | MENUITEMFLAG_BIGFONT,
+		L_OPTIONS_110, // "Exit Game"
+		0x00000007,
+		(void *)&g_ExitGameMenuDialog,
+	},
+#endif
 	{ MENUITEMTYPE_END },
 };
 

src/include/game/mainmenu.h

@@ -10,6 +10,9 @@ extern struct menudialogdef g_AcceptMissionMenuDialog;
 extern struct menudialogdef g_PreAndPostMissionBriefingMenuDialog;
 extern struct menudialogdef g_RetryMissionMenuDialog;
 extern struct menudialogdef g_NextMissionMenuDialog;
+#ifndef PLATFORM_N64
+extern struct menudialogdef g_ExitGameMenuDialog;
+#endif
 
 char *menuTextCurrentStageName(struct menuitem *item);
 char *soloMenuTextDifficulty(struct menuitem *item);