Passes_walls

While testing the secret door message handling, I wanted to phaze
through solid rock to get near some secret corridors.  Instead of
polymorphing into a xorn, I used #wizintrinsic to get temporary pass
through walls.  That let me move orthogonally through rock but not
diagonally.  Polymorph to xorn did allow diagonal movement.  I think
the difference was gaining 18/100 strength in that form.

Have wall phazing override narrow diagonal checks.

src/hack.c

@@ -834,6 +834,9 @@ cant_squeeze_thru(struct monst *mon)
     int amt;
     struct permonst *ptr = mon->data;
 
+    if ((mon == &g.youmonst) ? Passes_walls : passes_walls(ptr))
+        return 0;
+
     /* too big? */
     if (bigmonst(ptr)
         && !(amorphous(ptr) || is_whirly(ptr) || noncorporeal(ptr)
@@ -842,7 +845,7 @@ cant_squeeze_thru(struct monst *mon)
 
     /* lugging too much junk? */
     amt = (mon == &g.youmonst) ? inv_weight() + weight_cap()
-                             : curr_mon_load(mon);
+                               : curr_mon_load(mon);
     if (amt > 600)
         return 2;