Bump dropbear to version 2013.57

git-svn-id: file:///var/svn/freetz/trunk@10385 149334a1-2f27-0410-a3b9-fc62619ac1e6
dropbear:
 * fix r10385, default value for DNS-host-lookup has changed in 2013.57
 * refs #2072


git-svn-id: file:///var/svn/freetz/trunk@10386 149334a1-2f27-0410-a3b9-fc62619ac1e6