package/dbus-broker: audit support needs libcap-ng

Since v14 in 2018, audit support has needed libcap-ng.

Fixes:
    http://autobuild.buildroot.org/results/43abdb85cc2f386d427cec1cfa876e20e3509cb8/

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Norbert Lange <nolange79@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/dbus-broker/Config.in

@@ -5,6 +5,7 @@ config BR2_PACKAGE_DBUS_BROKER
 	depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_17
 	depends on BR2_PACKAGE_SYSTEMD
 	select BR2_PACKAGE_EXPAT
+	select BR2_PACKAGE_LIBCAP_NG if BR2_PACKAGE_AUDIT
 	help
 	  Linux D-Bus Message Broker.
 

package/dbus-broker/dbus-broker.mk

@@ -28,7 +28,8 @@ DBUS_BROKER_DEPENDENCIES = expat systemd
 DBUS_BROKER_CONF_OPTS = -Dlauncher=true
 
 ifeq ($(BR2_PACKAGE_AUDIT),y)
-DBUS_BROKER_DEPENDENCIES += audit
+# libcap-ng selected from Config.in
+DBUS_BROKER_DEPENDENCIES += audit libcap-ng
 DBUS_BROKER_CONF_OPTS += -Daudit=true
 else
 DBUS_BROKER_CONF_OPTS += -Daudit=false