fix B12001 - ?--More--single line menu

From a bug report:
3.4.0 broke the ability to pick the only listed inventory letter when
user typed '?' during object selection and one candidate was listed on
the top line followed by --More--.

What do you want to throw? [b or ?*] ?
b - 7 +0 daggers (alternate weapon; not wielded).--More--b
<behaved as if user hit ESC instead of 'b' but didn't say "Never mind.">

(Dismissing --More-- the normal way and getting a new selection prompt
worked as usual.)  The problem was caused by changes in getobj's count
handling; the message_menu() routine isn't able to handle counts but
display_pickinv left the count as 0 while caller expects -1 for "count
not specified".

     This was a core bug but I put the fixes entry under "tty" since
no other interfaces are affected.

src/invent.c

@@ -1,4 +1,4 @@
-/*	SCCS Id: @(#)invent.c	3.4	2002/04/07	*/
+/*	SCCS Id: @(#)invent.c	3.4	2002/09/16	*/
 /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -1677,6 +1677,7 @@ long* out_cnt;
 		    ret = message_menu(lets[0],
 			  want_reply ? PICK_ONE : PICK_NONE,
 			  xprname(otmp, (char *)0, lets[0], TRUE, 0L, 0L));
+		    if (out_cnt) *out_cnt = -1L;	/* select all */
 		    break;
 		}
 	    }