uhttpd: update to git head, fixes regression when parsing IPv6 listen arguments

git-svn-id: svn://svn.openwrt.org/openwrt@36348 3c298f89-4303-0410-b956-a3cf2f4a3e73
[ramips] fix prepare_generic_squashfs

prepare_generic_squashfs was called twice on the generated images breaking mount_root

Signed-off-by: John Crispin <blogic@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt@36349 3c298f89-4303-0410-b956-a3cf2f4a3e73