gssdp: add hash for license file

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gssdp/gssdp.hash

@@ -1,2 +1,5 @@
 # Hash from: http://ftp.gnome.org/pub/gnome/sources/gssdp/1.0/gssdp-1.0.2.sha256sum:
 sha256 a1e17c09c7e1a185b0bd84fd6ff3794045a3cd729b707c23e422ff66471535dc  gssdp-1.0.2.tar.xz
+
+# Hash for license file:
+sha256 d245807f90032872d1438d741ed21e2490e1175dc8aa3afa5ddb6c8e529b58e5  COPYING