Fix for bug 78407: extra safeguard against overpopping the email list when pruning people who aren't supposed to get mail.

Patch by Jake Steenhagen <jake@acutex.net>
r= justdave@syndicomm.com

webtools/bugzilla/processmail

@@ -329,6 +329,7 @@ sub filterExcludeList ($$) {
             # match found, so we remove the entry
             if ($included eq $excluded) {
                 pop(@result);
+                last;
             }
         }
     }