package/systemd: add optional bash-completion dependency

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/systemd/systemd.mk

@@ -10,6 +10,7 @@ SYSTEMD_LICENSE = LGPL-2.1+, GPL-2.0+ (udev), Public Domain (few source files, s
 SYSTEMD_LICENSE_FILES = LICENSE.GPL2 LICENSE.LGPL2.1 README
 SYSTEMD_INSTALL_STAGING = YES
 SYSTEMD_DEPENDENCIES = \
+	$(if $(BR2_PACKAGE_BASH_COMPLETION),bash-completion) \
 	host-gperf \
 	host-intltool \
 	kmod \