package/libressl: add LIBRESSL_CPE_ID_VENDOR

cpe:2.3:a:openbsd:libressl is a valid CPE identifier for this package:

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libressl/libressl.mk

@@ -8,6 +8,7 @@ LIBRESSL_VERSION = 3.2.3
 LIBRESSL_SITE = https://ftp.openbsd.org/pub/OpenBSD/LibreSSL
 LIBRESSL_LICENSE = ISC (new additions), OpenSSL or SSLeay (original OpenSSL code)
 LIBRESSL_LICENSE_FILES = COPYING
+LIBRESSL_CPE_ID_VENDOR = openbsd
 LIBRESSL_INSTALL_STAGING = YES
 
 ifeq ($(BR2_PACKAGE_LIBRESSL_BIN),)