readline: needs ncurses, so select it in kconfig

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

package/readline/Config.in

@@ -1,5 +1,5 @@
-#
 config BR2_PACKAGE_READLINE
 	bool "readline"
+	select BR2_PACKAGE_NCURSES
 	help
 	    Enable GNU readline support?