Add missing forward reference

sdk/xtdk/xtstruct.h

@@ -270,6 +270,7 @@ typedef struct _XTBL_BOOTMENU_ITEM XTBL_BOOTMENU_ITEM, *PXTBL_BOOTMENU_ITEM;
 typedef struct _XTBL_CONFIG_ENTRY XTBL_CONFIG_ENTRY, *PXTBL_CONFIG_ENTRY;
 typedef struct _XTBL_CONFIG_SECTION XTBL_CONFIG_SECTION, *PXTBL_CONFIG_SECTION;
 typedef struct _XTBL_DIALOG_HANDLE XTBL_DIALOG_HANDLE, *PXTBL_DIALOG_HANDLE;
+typedef struct _XTBL_EXECUTABLE_IMAGE_PROTOCOL XTBL_EXECUTABLE_IMAGE_PROTOCOL, *PXTBL_EXECUTABLE_IMAGE_PROTOCOL;
 typedef struct _XTBL_KNOWN_BOOT_PROTOCOL XTBL_KNOWN_BOOT_PROTOCOL, *PXTBL_KNOWN_BOOT_PROTOCOL;
 typedef struct _XTBL_LOADER_PROTOCOL XTBL_LOADER_PROTOCOL, *PXTBL_LOADER_PROTOCOL;
 typedef struct _XTBL_MODULE_DEPS XTBL_MODULE_DEPS, *PXTBL_MODULE_DEPS;