(Vlast_event_frame): Define unconditionally.

(syms_of_keyboard): Always make the Lisp var.

src/keyboard.c

@@ -242,12 +242,12 @@ int last_point_position;
    like Fselect_frame, to make sure that a switch-frame event is
    generated by the next character.  */
 Lisp_Object internal_last_event_frame;
+#endif
 
 /* A user-visible version of the above, intended to allow users to
    figure out where the last event came from, if the event doesn't
    carry that information itself (i.e. if it was a character).  */
 Lisp_Object Vlast_event_frame;
-#endif
 
 /* The timestamp of the last input event we received from the X server.
    X Windows wants this for selection ownership.  */
@@ -5911,12 +5911,10 @@ by position only.");
     "*Number of complete keys read from the keyboard so far.");
   num_input_keys = 0;
 
-#ifdef MULTI_FRAME
   DEFVAR_LISP ("last-event-frame", &Vlast_event_frame,
     "*The frame in which the most recently read event occurred.\n\
 If the last event came from a keyboard macro, this is set to `macro'.");
   Vlast_event_frame = Qnil;
-#endif
 
   DEFVAR_LISP ("help-char", &Vhelp_char,
     "Character to recognize as meaning Help.\n\