make: add license info

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

package/make/make.mk

@@ -7,6 +7,8 @@
 MAKE_VERSION = 3.82
 MAKE_SOURCE = make-$(MAKE_VERSION).tar.bz2
 MAKE_SITE = $(BR2_GNU_MIRROR)/make
+MAKE_LICENSE = GPLv3+
+MAKE_LICENSE_FILES = COPYING
 
 MAKE_DEPENDENCIES = $(if $(BR2_NEEDS_GETTEXT_IF_LOCALE),gettext)