package/libplist: add LIBPLIST_CPE_ID_VENDOR

cpe:2.3:a:libimobiledevice:libplist is a valid CPE identifier for this
package:

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

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

package/libplist/libplist.mk

@@ -9,6 +9,7 @@ LIBPLIST_SITE = $(call github,libimobiledevice,libplist,$(LIBPLIST_VERSION))
 LIBPLIST_INSTALL_STAGING = YES
 LIBPLIST_LICENSE = LGPL-2.1+
 LIBPLIST_LICENSE_FILES = COPYING
+LIBPLIST_CPE_ID_VENDOR = libimobiledevice
 # github tarball does not include configure
 LIBPLIST_AUTORECONF = YES