package/casync: fix zstd dependency to correct package name

Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 807bf505f42997f98f8acb7c7046ca5f97df08bb)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/casync/casync.mk

@@ -40,8 +40,8 @@ else
 CASYNC_CONF_OPTS += -Dudev=false
 endif
 
-ifeq ($(BR2_PACKAGE_LIBZSTD),y)
-CASYNC_DEPENDENCIES += libzstd
+ifeq ($(BR2_PACKAGE_ZSTD),y)
+CASYNC_DEPENDENCIES += zstd
 CASYNC_CONF_OPTS += -Dlibzstd=enabled
 else
 CASYNC_CONF_OPTS += -Dlibzstd=disabled