package/samba4: add optional dependency to dbus

samba4 picks up dbus as dependency if it was built before:

Checking for dbus                : yes
Checking for header dbus/dbus.h  : yes
Checking for library dbus-1      : yes

There is no configure option to control dbus support so we just make
sure dbus is built before samba4 to have reproducible builds.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/samba4/samba4.mk

@@ -44,6 +44,10 @@ else
 SAMBA4_CONF_OPTS += --disable-cups
 endif
 
+ifeq ($(BR2_PACKAGE_DBUS),y)
+SAMBA4_DEPENDENCIES += dbus
+endif
+
 ifeq ($(BR2_PACKAGE_DBUS)$(BR2_PACKAGE_AVAHI_DAEMON),yy)
 SAMBA4_CONF_OPTS += --enable-avahi
 SAMBA4_DEPENDENCIES += avahi