Force makefile to git clone deps

Makefile

@@ -5,12 +5,12 @@ PROJECT_DESCRIPTION = EMQ X Broker
 
 DEPS = jsx gproc gen_rpc ekka esockd cowboy replayq
 
-dep_jsx     = hex-emqx 2.9.0
-dep_gproc   = hex-emqx 0.8.0
+dep_jsx     = git-emqx https://github.com/talentdeficit/jsx 2.9.0
+dep_gproc   = git-emqx https://github.com/uwiger/gproc 0.8.0
 dep_gen_rpc = git-emqx https://github.com/emqx/gen_rpc 2.3.1
 dep_esockd  = git-emqx https://github.com/emqx/esockd v5.4.4
 dep_ekka    = git-emqx https://github.com/emqx/ekka v0.5.3
-dep_cowboy  = hex-emqx 2.4.0
+dep_cowboy  = git-emqx https://github.com/ninenines/cowboy 2.4.0
 dep_replayq = git-emqx https://github.com/emqx/replayq v0.1.1
 
 NO_AUTOPATCH = cuttlefish