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/polyself.c

@@ -1043,6 +1043,7 @@ dogaze()
 				    -d((int)mtmp->m_lev+1,
 					    (int)mtmp->data->mattk[0].damd)
 				    : -200);
+			    nomovemsg = 0;
 			    return 1;
 			} else
 			    You("stiffen momentarily under %s gaze.",