Vault guard shouldn't be heard from too far away

When you were asked for a name and teleported out of the vault without
any gold on you, the vault guard says "Well, begone" - which could be
heard from anywhere on the level.

Limit that verbalization to 10 tiles away.

doc/fixes5-0-0.txt

@@ -1605,6 +1605,7 @@ when starting a new game as a monk, newsym(0,0) was being called (adjabil ->
 incorporate a fix to prevent segfault due to rolling boulder trap
 wands of digging generate less often lategame
 more strict checking of dishonourable attacks
+vault guard verbalization shouldn't be heard from too far away
 
 
 Fixes to 5.0.0-x General Problems Exposed Via git Repository

src/vault.c

@@ -1000,7 +1000,7 @@ gd_move(struct monst *grd)
                 gd_letknow(grd);
                 return -1;
             } else {
-                if (!Deaf) {
+                if (!Deaf && mdistu(grd) <= 10*10) {
                     SetVoice(grd, 0, 80, 0);
                     verbalize("Well, begone.");
                 }