package/x11r7/xlib_libX11: add CPE variables

cpe:2.3:a:x.org:libx11 is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Ax.org%3Alibx11

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

package/x11r7/xlib_libX11/xlib_libX11.mk

@@ -9,6 +9,8 @@ XLIB_LIBX11_SOURCE = libX11-$(XLIB_LIBX11_VERSION).tar.bz2
 XLIB_LIBX11_SITE = https://xorg.freedesktop.org/archive/individual/lib
 XLIB_LIBX11_LICENSE = MIT
 XLIB_LIBX11_LICENSE_FILES = COPYING
+XLIB_LIBX11_CPE_ID_VENDOR = x.org
+XLIB_LIBX11_CPE_ID_PRODUCT = libx11
 XLIB_LIBX11_INSTALL_STAGING = YES
 XLIB_LIBX11_DEPENDENCIES = \
 	libxcb \