package/crun: add libgcrypt optional dependency

libgcrypt is an optional dependency which is enabled by default since
version 1.7 and
https://github.com/containers/crun/commit/dd310aaf5aee336d0f6236c1c2add7b7cb030482

Unfortunately, thetre are no associated --enable/disable flags; it all
depends on auto-detection.

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Christian Stewart <christian@paral.in>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/crun/crun.mk

@@ -26,6 +26,10 @@ else
 CRUN_CONF_OPTS += --disable-caps
 endif
 
+ifeq ($(BR2_PACKAGE_LIBGCRYPT),y)
+CRUN_DEPENDENCIES += libgcrypt
+endif
+
 ifeq ($(BR2_PACKAGE_LIBSECCOMP),y)
 CRUN_DEPENDENCIES += libseccomp
 CRUN_CONF_OPTS += --enable-seccomp