Fixed a problem with --skip-networking.

This fix should be merged into 4.0 and 4.1

sql/mysqld.cc

@@ -1121,7 +1121,7 @@ void end_thread(THD *thd, bool put_in_cache)
 inline void kill_broken_server()
 {
   /* hack to get around signals ignored in syscalls for problem OS's */
-  if (unix_sock == INVALID_SOCKET || ip_sock ==INVALID_SOCKET)
+  if (unix_sock == INVALID_SOCKET || (!opt_disable_networking && ip_sock ==INVALID_SOCKET))
   {
     select_thread_in_use = 0;
     kill_server((void*)MYSQL_KILL_SIGNAL); /* never returns */