gupnp: update to latest version (0.19.4), dependency on newer version of gssdp
gssdp: updated due to dependency

Signed-off-by: Tim Yardley <yardley@gmail.com>



git-svn-id: svn://svn.openwrt.org/openwrt/packages@35523 3c298f89-4303-0410-b956-a3cf2f4a3e73