package/nghttp2: add NGHTTP2_CPE_ID_VENDOR

cpe:2.3:a:nghttp2:nghttp2 is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Anghttp2%3Anghttp2

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

package/nghttp2/nghttp2.mk

@@ -9,6 +9,7 @@ NGHTTP2_SITE = https://github.com/nghttp2/nghttp2/releases/download/v$(NGHTTP2_V
 NGHTTP2_LICENSE = MIT
 NGHTTP2_LICENSE_FILES = COPYING
 NGHTTP2_INSTALL_STAGING = YES
+NGHTTP2_CPE_ID_VENDOR = nghttp2
 NGHTTP2_DEPENDENCIES = host-pkgconf
 NGHTTP2_CONF_OPTS = --enable-lib-only