package/rpm: add optional bzip2 dependency

There is no --{disable,enable}-bzip2 option

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

package/rpm/rpm.mk

@@ -8,7 +8,13 @@ RPM_VERSION_MAJOR = 4.14
 RPM_VERSION = $(RPM_VERSION_MAJOR).2.1
 RPM_SOURCE = rpm-$(RPM_VERSION).tar.bz2
 RPM_SITE = http://ftp.rpm.org/releases/rpm-$(RPM_VERSION_MAJOR).x
-RPM_DEPENDENCIES = host-pkgconf berkeleydb file popt zlib \
+RPM_DEPENDENCIES = \
+	host-pkgconf \
+	berkeleydb \
+	$(if $(BR2_PACKAGE_BZIP2),bzip2) \
+	file \
+	popt \
+	zlib \
 	$(TARGET_NLS_DEPENDENCIES)
 RPM_LICENSE = GPL-2.0 or LGPL-2.0 (library only)
 RPM_LICENSE_FILES = COPYING