Upgrade unbound library

These files were pulled from the 1.6.3 release tarball.

This new version builds against OpenSSL version 1.1 which will be
the default in the new Debian Stable which is due to be released
RealSoonNow (tm).

external/unbound/testcode/do-tests.sh

@@ -9,6 +9,7 @@ NEED_CURL='06-ianaports.tpkg root_anchor.tpkg'
 NEED_WHOAMI='07-confroot.tpkg'
 NEED_IPV6='fwd_ancil.tpkg fwd_tcp_tc6.tpkg stub_udp6.tpkg edns_cache.tpkg'
 NEED_NOMINGW='tcp_sigpipe.tpkg 07-confroot.tpkg 08-host-lib.tpkg fwd_ancil.tpkg'
+NEED_DNSCRYPT_PROXY='dnscrypt_queries.tpkg'
 
 # test if dig and ldns-testns are available.
 test_tool_avail "dig"
@@ -39,6 +40,7 @@ for test in `ls *.tpkg`; do
 	skip_if_in_list $test "$NEED_XXD" "xxd"
 	skip_if_in_list $test "$NEED_NC" "nc"
 	skip_if_in_list $test "$NEED_WHOAMI" "whoami"
+	skip_if_in_list $test "$NEED_DNSCRYPT_PROXY" "dnscrypt-proxy"
 
 	if echo $NEED_IPV6 | grep $test >/dev/null; then
 		if test "$HAVE_IPV6" = no; then