package/smartmontools: add libselinux optional dependency

libselinux is an optional dependency since a very long time (2010) and
https://github.com/mirror/smartmontools/commit/ab807ee43bd4821f5e0e010de08a746d88506b17

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 33b6b6b3e20609e1b99b3d2953b83bae2b6842bb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/smartmontools/smartmontools.mk

@@ -16,4 +16,11 @@ else
 SMARTMONTOOLS_CONF_OPTS += --without-libcap-ng
 endif
 
+ifeq ($(BR2_PACKAGE_LIBSELINUX),y)
+SMARTMONTOOLS_CONF_OPTS += --with-selinux
+SMARTMONTOOLS_DEPENDENCIES += libselinux
+else
+SMARTMONTOOLS_CONF_OPTS += --without-selinux
+endif
+
 $(eval $(autotools-package))