package/nginx: add NGINX_CPE_ID_VENDOR

cpe:2.3:a:nginx:nginx is a valid CPE identifier for this package:

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

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
diff --git a/package/nginx/nginx.mk b/package/nginx/nginx.mk
index fb06108..9c32546 100644
--- a/package/nginx/nginx.mk
+++ b/package/nginx/nginx.mk
@@ -8,6 +8,7 @@
 NGINX_SITE = http://nginx.org/download
 NGINX_LICENSE = BSD-2-Clause
 NGINX_LICENSE_FILES = LICENSE
+NGINX_CPE_ID_VENDOR = nginx
 NGINX_DEPENDENCIES = host-pkgconf
 
 NGINX_CONF_OPTS = \