msgpack; fix build on ubuntu 20.04

ubuntu 20.04 uses msgpack 3.0.1-3, however daemon doesn't seems
to build (msgpack_pack not found). This fix the build for ubuntu 20.04

Change-Id: I84d50b94b2e7b40d9cd8a599dd5d7da8c2ac4194

contrib/src/msgpack/rules.mak

@@ -3,7 +3,7 @@ MSGPACK_VERSION := cpp-3.2.0
 MSGPACK_URL := https://github.com/msgpack/msgpack-c/archive/$(MSGPACK_VERSION).tar.gz
 
 PKGS += msgpack
-ifeq ($(call need_pkg,"msgpack >= 3.0.0"),)
+ifeq ($(call need_pkg,"msgpack >= 3.1.0"),)
 PKGS_FOUND += msgpack
 endif