package/systemd: disable zstd for host-systemd

systemd 246 added support for zstd compression of large fields in
journal files [1]. Since zstd is only used at runtime, we don't
need it to enable its support in host-systemd.

[1] https://github.com/systemd/systemd/blob/v246/NEWS#L323-L331

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit f5b89563d7e1c507b565676bbce72c06830ae74f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/systemd/systemd.mk

@@ -701,7 +701,8 @@ HOST_SYSTEMD_CONF_OPTS = \
 	-Dkernel-install=false \
 	-Dsystemd-analyze=false \
 	-Dlibcryptsetup=false \
-	-Daudit=false
+	-Daudit=false \
+	-Dzstd=false
 
 HOST_SYSTEMD_DEPENDENCIES = \
 	$(BR2_COREUTILS_HOST_DEPENDENCY) \