Use remote threads on supported platforms

Scenes/Global/Remote.gd

@@ -18,6 +18,9 @@ func fetch(url: String, cbObj: Object, cbFn: String):
 		cbObj.call(cbFn, HTTPRequest.RESULT_SUCCESS, 200, [], buf)
 		return
 	var req := HTTPRequest.new()
+	# On HTML5 we cannot use threaded requests
+	# On other platforms (such as Android), we *need* to!
+	req.use_threads = !OS.has_feature("HTML5")
 	add_child(req)
 	req.connect("request_completed", self, "_request_completed", [url, cbObj, cbFn])
 	req.request(url)