dhcpdump: add licensing info

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dhcpdump/dhcpdump.mk

@@ -5,9 +5,10 @@
 ################################################################################
 
 DHCPDUMP_VERSION = 1.8
-DHCPDUMP_SITE    = http://www.mavetju.org/download/
-
+DHCPDUMP_SITE  = http://www.mavetju.org/download/
 DHCPDUMP_DEPENDENCIES = libpcap
+DHCPDUMP_LICENSE = BSD-2c
+DHCPDUMP_LICENSE_FILES = LICENSE
 
 define DHCPDUMP_BUILD_CMDS
 	$(MAKE) -C $(@D) CC="$(TARGET_CC) $(TARGET_CFLAGS)"