patch 8.1.0695: internal error when using :popup

Problem:    Internal error when using :popup.
Solution:   When a menu only exists in Terminal mode give an error. (Naruhiko
            Nishino, closes #3765)
diff --git a/src/globals.h b/src/globals.h
index 2a7ecd1..3f67d13 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -1583,6 +1583,9 @@
 #endif
 EXTERN char_u e_dirnotf[]	INIT(= N_("E919: Directory not found in '%s': \"%s\""));
 EXTERN char_u e_au_recursive[]	INIT(= N_("E952: Autocommand caused recursive behavior"));
+#ifdef FEAT_MENU
+EXTERN char_u e_menuothermode[] INIT(= N_("E328: Menu only exists in another mode"));
+#endif
 
 #ifdef FEAT_GUI_MAC
 EXTERN short disallow_gui	INIT(= FALSE);