memtester: add license info

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/memtester/memtester.mk

@@ -6,6 +6,8 @@
 MEMTESTER_VERSION = 4.3.0
 MEMTESTER_SOURCE = memtester-$(MEMTESTER_VERSION).tar.gz
 MEMTESTER_SITE = http://pyropus.ca/software/memtester/old-versions/
+MEMTESTER_LICENSE = GPLv2
+MEMTESTER_LICENSE_FILES = COPYING
 
 MEMTESTER_TARGET_INSTALL_OPTS = INSTALLPATH=$(TARGET_DIR)/usr