Use https path to git modules, git:// doesn't always work behind a firewall

.gitmodules

 [submodule "third_party/lua-cjson"]
 	path = third_party/lua-cjson
-	url = git://github.com/mpx/lua-cjson.git
+	url = https://github.com/mpx/lua-cjson.git
 [submodule "third_party/luajit"]
 	path = third_party/luajit
-    url = git://github.com/tarantool/luajit.git
+    url = https://github.com/tarantool/luajit.git