chrony: add optional seccomp support

seccomp support has been available since chrony-2.2

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/chrony/chrony.mk

@@ -13,7 +13,6 @@ CHRONY_CONF_OPTS = \
 	--host-system=Linux \
 	--host-machine=$(BR2_ARCH) \
 	--prefix=/usr \
-	--without-seccomp \
 	--without-tomcrypt
 
 ifeq ($(BR2_PACKAGE_LIBCAP),y)
@@ -28,6 +27,13 @@ else
 CHRONY_CONF_OPTS += --without-nss
 endif
 
+ifeq ($(BR2_PACKAGE_LIBSECCOMP),y)
+CHRONY_CONF_OPTS += --enable-scfilter
+CHRONY_DEPENDENCIES += libseccomp
+else
+CHRONY_CONF_OPTS += --without-seccomp
+endif
+
 ifeq ($(BR2_PACKAGE_READLINE),y)
 CHRONY_DEPENDENCIES += readline
 else