patch for taking notice of UPNP_USE_RWLOCK flag in threadutil

By "Carl Benson" <carl.benson@windriver.com>:

I had to do some modifications myself though, because the Android
build system insists on having a file named "util.h" taking precedence
in its include path, libupnp gets confused because of the same filename
in upnp/src/inc/util.h

upnp/src/api/upnpapi.c

@@ -122,6 +122,7 @@ ithread_mutex_t GlobalClientSubscribeMutex;
 /*! rwlock to synchronize handles (root device or control point handle). */
 ithread_rwlock_t GlobalHndRWLock;
 
+
 /*! Mutex to synchronize the uuid creation process. */
 ithread_mutex_t gUUIDMutex;