contrib: upnp has config.* in a custom dir

(cherry picked from commit 9b100a5a7ea90ce626cc68430b083040a2749c5e)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

contrib/src/upnp/rules.mak

@@ -21,7 +21,7 @@ ifdef HAVE_WIN32
 	$(APPLY) $(SRC)/upnp/libupnp-win32.patch
 	$(APPLY) $(SRC)/upnp/libupnp-win64.patch
 endif
-	$(UPDATE_AUTOCONFIG)
+	$(UPDATE_AUTOCONFIG) && cd $(UNPACK_DIR) && mv config.guess config.sub build-aux/
 	$(MOVE)
 
 .upnp: upnp