package/unbound: add UNBOUND_CPE_ID_VENDOR

cpe:2.3:a:nlnetlabs:unbound is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Anlnetlabs%3Aunbound

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/unbound/unbound.mk

@@ -9,6 +9,7 @@ UNBOUND_SITE = https://www.unbound.net/downloads
 UNBOUND_DEPENDENCIES = host-pkgconf expat libevent openssl
 UNBOUND_LICENSE = BSD-3-Clause
 UNBOUND_LICENSE_FILES = LICENSE
+UNBOUND_CPE_ID_VENDOR = nlnetlabs
 UNBOUND_CONF_OPTS = \
 	--disable-rpath \
 	--disable-debug \