package/gnupg2: add bzip2 optional dependency

This is to improve build reproducibility.

[Thomas: add --enable-bzip2 --with-bzip options.]

Signed-off-by: Romain Naour <romain.naour@openwide.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gnupg2/gnupg2.mk

@@ -26,4 +26,11 @@ endef
 GNUPG2_POST_INSTALL_TARGET_HOOKS += GNUPG2_REMOVE_GPGV2
 endif
 
+ifeq ($(BR2_PACKAGE_BZIP2),y)
+GNUPG2_CONF_OPT += --enable-bzip2 --with-bzip2=$(STAGING_DIR)
+GNUPG2_DEPENDENCIES += bzip2
+else
+GNUPG2_CONF_OPT += --disable-bzip2
+endif
+
 $(eval $(autotools-package))