contrib: update OpenDHT

Change-Id: Ia3b830e67401e8875842af6207de86da0ebd2807

contrib/src/opendht/SHA512SUMS

-a9f872017ce90ec8220dabe4569d8811850e34bad58524985110112d73b7c3555b44dffc3c5d0e0c9774b0d132356af67ba584336f14fc1bc857969925050dbe  opendht-6c2f791c4dd9b52acb61194b4ebda2129d6e2ec3.tar.gz
\ No newline at end of file
+e0bf8700a91a328e38306d2739a59787420d42d69f01e226a35e308a7db62736a9007b5c1fbaf22ee2f685f62bd834ae4f8efe868621eee97de790f711763eb4  opendht-5ffb5c628d8999cdc01ca7c785b6f9ae13201a18.tar.gz

contrib/src/opendht/package.json

 {
     "name": "opendht",
-    "version": "6c2f791c4dd9b52acb61194b4ebda2129d6e2ec3",
+    "version": "5ffb5c628d8999cdc01ca7c785b6f9ae13201a18",
     "url": "https://github.com/savoirfairelinux/opendht/archive/__VERSION__.tar.gz",
     "deps": [
         "argon2",

contrib/src/opendht/rules.mak

 # OPENDHT
-OPENDHT_VERSION := 6c2f791c4dd9b52acb61194b4ebda2129d6e2ec3
+OPENDHT_VERSION := 5ffb5c628d8999cdc01ca7c785b6f9ae13201a18
 OPENDHT_URL := https://github.com/savoirfairelinux/opendht/archive/$(OPENDHT_VERSION).tar.gz
 
 PKGS += opendht