util-linux: add optional dependency on readline

fdisk and sfdisk tools can be built with readline support. This patch
adds optional dependency on readline if it is already selected.

Signed-off-by: Rahul Bedarkar <rahul.bedarkar@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/util-linux/util-linux.mk

@@ -146,6 +146,13 @@ else
 UTIL_LINUX_CONF_OPTS += --without-python
 endif
 
+ifeq ($(BR2_PACKAGE_READLINE),y)
+UTIL_LINUX_CONF_OPTS += --with-readline
+UTIL_LINUX_DEPENDENCIES += readline
+else
+UTIL_LINUX_CONF_OPTS += --without-readline
+endif
+
 # Install PAM configuration files
 ifeq ($(BR2_PACKAGE_UTIL_LINUX_LOGIN_UTILS),y)
 define UTIL_LINUX_INSTALL_PAMFILES