rsyslog: enable journal plugins when using systemd

The rsyslog package provides input and output plugins for journald which
are disabled by default. The following adds the option to include
`imjournal` and `omjournal` modules when building for a systemd target.

Signed-off-by: James Knight <james.knight@rockwellcollins.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/rsyslog/rsyslog.mk

@@ -66,8 +66,14 @@ endif
 
 ifeq ($(BR2_INIT_SYSTEMD),y)
 RSYSLOG_CONF_OPTS += \
+	--enable-imjournal \
+	--enable-omjournal \
 	--with-systemdsystemunitdir=/usr/lib/systemd/system
 RSYSLOG_DEPENDENCIES += systemd
+else
+RSYSLOG_CONF_OPTS += \
+	--disable-imjournal \
+	--disable-omjournal
 endif
 
 define RSYSLOG_INSTALL_INIT_SYSV