mpd: force zeroconf to no

without this we get missing dependecy errors if avahi is staged.

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

libtorrent requires zlib to be linked

Signed-off-by: John Crispin <blogic@openwrt.org>
ctorrent-svn: update download url

old url is dead.

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