[tools] mkimage: update to 2013.04

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36550 3c298f89-4303-0410-b956-a3cf2f4a3e73
haproxy:
 - add health check fix



git-svn-id: svn://svn.openwrt.org/openwrt@36551 3c298f89-4303-0410-b956-a3cf2f4a3e73