package/libxkbcommon: add LIBXKBCOMMON_CPE_ID_VENDOR

cpe:2.3:a:xkbcommon:libxkbcommon is a valid CPE identifier for this
package:

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

Cc: Quentin Schulz <foss+buildroot@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libxkbcommon/libxkbcommon.mk

@@ -9,6 +9,7 @@ LIBXKBCOMMON_SITE = https://xkbcommon.org/download
 LIBXKBCOMMON_SOURCE = libxkbcommon-$(LIBXKBCOMMON_VERSION).tar.xz
 LIBXKBCOMMON_LICENSE = MIT/X11
 LIBXKBCOMMON_LICENSE_FILES = LICENSE
+LIBXKBCOMMON_CPE_ID_VENDOR = xkbcommon
 LIBXKBCOMMON_INSTALL_STAGING = YES
 LIBXKBCOMMON_DEPENDENCIES = host-bison host-flex
 LIBXKBCOMMON_CONF_OPTS = \