package/fetchmail: set FETCHMAIL_CPE_ID_VENDOR

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

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

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

package/fetchmail/fetchmail.mk

@@ -10,6 +10,7 @@ FETCHMAIL_SOURCE = fetchmail-$(FETCHMAIL_VERSION).tar.xz
 FETCHMAIL_SITE = http://downloads.sourceforge.net/project/fetchmail/branch_$(FETCHMAIL_VERSION_MAJOR)
 FETCHMAIL_LICENSE = GPL-2.0; some exceptions are mentioned in COPYING
 FETCHMAIL_LICENSE_FILES = COPYING
+FETCHMAIL_CPE_ID_VENDOR = fetchmail
 
 FETCHMAIL_CONF_OPTS = \
 	--with-ssl=$(STAGING_DIR)/usr