finally finished but not eating

Finally apply the patch sent by <Someone> in 11/2003 for slashem-Bugs-799278,
updated to match the current code and handle additional cases.  The fix
is brute force: always ensure nomovemsg is set when nomul is called with
a negative value.  I also scanned the code for places manually setting
multi negative, they all set nomovemsg.  It would be nice to have a function
that did the right thing, but there are several special cases and I was
not feeling creative.

src/sounds.c

@@ -619,6 +619,7 @@ register struct monst *mtmp;
 	    pline("%s rattles noisily.", Monnam(mtmp));
 	    You("freeze for a moment.");
 	    nomul(-2);
+	    nomovemsg = 0;
 	    break;
 	case MS_LAUGH:
 	    {