gnutls: updated to address CVE-2014-8564

Signed-off-by: Nikos Mavrogiannopoulos <nmav@gnutls.org>
erlang: bump to 17.3

Signed-off-by: Nicolas Thill <nico@openwrt.org>
fastd: update to v15

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>