contrib: update required opendht version to 3.3

Change-Id: Ide2ef47acda8c423bfa14355e42ecdb3afbb7c36

contrib/src/opendht/rules.mak

@@ -3,7 +3,7 @@ OPENDHT_VERSION := b0fa19d6f8a5f6af884b278f4351e5733c6a99e2
 OPENDHT_URL := https://github.com/savoirfairelinux/opendht/archive/$(OPENDHT_VERSION).tar.gz
 
 PKGS += opendht
-ifeq ($(call need_pkg,'opendht >= 3.1.7'),)
+ifeq ($(call need_pkg,'opendht >= 3.3.0'),)
 PKGS_FOUND += opendht
 endif