nettle: downgrade to 2.7.1 since gnutls is incompatible with 3.0

Signed-off-by: Steven Barth <steven@midlink.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41263 3c298f89-4303-0410-b956-a3cf2f4a3e73
dnsmasq: removing nettle 3.0 support due to nettle downgrade

Signed-off-by: Steven Barth <steven@midlink.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41264 3c298f89-4303-0410-b956-a3cf2f4a3e73