udpcast: add license information

[Peter: GPL license is v2+]
Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/udpcast/udpcast.mk

@@ -7,6 +7,8 @@
 UDPCAST_VERSION = 20120424
 UDPCAST_SITE = http://www.udpcast.linux.lu/download
 UDPCAST_DEPENDENCIES = host-m4
+UDPCAST_LICENSE = BSD-2c, GPLv2+
+UDPCAST_LICENSE_FILES = COPYING
 
 define UDPCAST_REMOVE_UDP_SENDER
 	rm -f $(TARGET_DIR)/usr/sbin/udp-sender