package/avahi: add AVAHI_CPE_ID_VENDOR

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

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

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

package/avahi/avahi.mk

@@ -8,6 +8,7 @@ AVAHI_VERSION = 0.8
 AVAHI_SITE = https://github.com/lathiat/avahi/releases/download/v$(AVAHI_VERSION)
 AVAHI_LICENSE = LGPL-2.1+
 AVAHI_LICENSE_FILES = LICENSE
+AVAHI_CPE_ID_VENDOR = avahi
 AVAHI_INSTALL_STAGING = YES
 
 AVAHI_CONF_ENV = \