package/swupdate: add optional zchunk support

This is required for delta update handler support.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/swupdate/swupdate.mk

@@ -172,6 +172,13 @@ else
 SWUPDATE_MAKE_ENV += HAVE_WOLFSSL=n
 endif
 
+ifeq ($(BR2_PACKAGE_ZCHUNK),y)
+SWUPDATE_DEPENDENCIES += zchunk
+SWUPDATE_MAKE_ENV += HAVE_ZCK=y
+else
+SWUPDATE_MAKE_ENV += HAVE_ZCK=n
+endif
+
 ifeq ($(BR2_PACKAGE_ZEROMQ),y)
 SWUPDATE_DEPENDENCIES += zeromq
 SWUPDATE_MAKE_ENV += HAVE_LIBZEROMQ=y