fix pull request #548 - encumbrance feedback

when polymorphing into "new man".  Characteristic stats are shuffled
if turning into new man, but when already polymorphed those get
overridden by the old pre-polymorph characteristics, resulting in
another encumbrance check which might contradict the one that just
happened.  Skip the encumbrance check done when shuffling stats so
that there's only one and it comes after all changes are finished.

Fixes #548

src/polyself.c

@@ -1,4 +1,4 @@
-/* NetHack 3.7	polyself.c	$NHDT-Date: 1613600809 2021/02/17 22:26:49 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.160 $ */
+/* NetHack 3.7	polyself.c	$NHDT-Date: 1626312523 2021/07/15 01:28:43 $  $NHDT-Branch: NetHack-3.7 $:$NHDT-Revision: 1.162 $ */
 /*      Copyright (C) 1987, 1988, 1989 by Ken Arromdee */
 /* NetHack may be freely redistributed.  See license for details. */
 
@@ -364,7 +364,9 @@ newman(void)
             g.killer.format = KILLED_BY_AN;
             Strcpy(g.killer.name, "unsuccessful polymorph");
             done(DIED);
+            /* must have been life-saved to get here */
             newuhs(FALSE);
+            (void) encumber_msg(); /* used to be done by redist_attr() */
             return; /* lifesaved */
         }
     }