[3.0] Backport upnp contrib update

Theses patches update and modernize the upnp stack for 3.0.x fixing fixing vulnerabilities and simplifying the code.

contrib/src/upnp/0001-Do-not-try-to-detach-detached-thread-the-result-is-u.patch

-From de5cd603acd5c81ec947fd9664817231a3d2c418 Mon Sep 17 00:00:00 2001
-From: Jean-Francois Dockes <jf@dockes.org>
-Date: Sun, 27 Jan 2019 10:44:17 +0100
-Subject: [PATCH] Do not try to detach detached thread, the result is
- undefined. Fixes issue #102
-
-(cherry picked from commit 386b7ed79146ecf7a3bba49f48cb8f41a9b49170)
----
- threadutil/src/ThreadPool.c | 5 -----
- 1 file changed, 5 deletions(-)
-
-diff --git a/threadutil/src/ThreadPool.c b/threadutil/src/ThreadPool.c
-index fcf71087..8c6cd092 100644
---- a/threadutil/src/ThreadPool.c
-+++ b/threadutil/src/ThreadPool.c
-@@ -651,11 +651,6 @@ static int CreateWorker(
- 	rc = ithread_create(&temp, &attr, WorkerThread, tp);
- 	ithread_attr_destroy(&attr);
- 	if (rc == 0) {
--		rc = ithread_detach(temp);
--		/* ithread_detach will return EINVAL if thread has been
--		 successfully detached by ithread_create */
--		if (rc == EINVAL)
--			rc = 0;
- 		tp->pendingWorkerThreadStart = 1;
- 		/* wait until the new worker thread starts */
- 		while (tp->pendingWorkerThreadStart) {
--- 
-2.27.0.windows.1
-