libupnp: add LICENSE hash and DEVELOPERS entry

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

DEVELOPERS

@@ -608,6 +608,7 @@ F:	package/gupnp-dlna/
 F:	package/gupnp-tools/
 F:	package/hiredis/
 F:	package/igd2-for-linux/
+F:	package/libupnp/
 F:	package/minissdpd/
 F:	package/motion/
 F:	package/tinycbor/

package/libupnp/libupnp.hash

@@ -1,2 +1,3 @@
 # Locally computed:
 sha256	0bdfacb7fa8d99b78343b550800ff193264f92c66ef67852f87f042fd1a1ebbc	libupnp-1.6.22.tar.bz2
+sha256	0375955c8a79d6e8fa0792d45d00fc4e7710d7ac95bcbd27f9225a83f5c946fd	LICENSE