readline: add license information

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/readline/readline.mk

@@ -10,6 +10,8 @@ READLINE_SITE = $(BR2_GNU_MIRROR)/readline
 READLINE_INSTALL_STAGING = YES
 READLINE_DEPENDENCIES = ncurses
 READLINE_CONF_ENV = bash_cv_func_sigsetjmp=yes
+READLINE_LICENSE = GPLv3+
+READLINE_LICENSE_FILES = COPYING
 
 define READLINE_INSTALL_TARGET_CMDS
 	$(MAKE1) DESTDIR=$(TARGET_DIR) -C $(@D) uninstall